Printable math worksheet for practicing addition with missing numbers.
Math worksheet titled "Missing Numbers in Equations (A)" with fill-in-the-blank addition problems.
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Step-by-step solution for: Missing Numbers in Equations (Blanks) -- Addition (Range 1 to 9) (A)
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Show Answer Key & Explanations
Step-by-step solution for: Missing Numbers in Equations (Blanks) -- Addition (Range 1 to 9) (A)
To solve this worksheet, we need to find the missing number in each equation. These are all addition problems where one part is missing.
The rule is simple: Part + Part = Whole.
If we know the Whole and one Part, we can find the missing Part by subtracting.
Whole - Known Part = Missing Part.
Let's go row by row, from left to right.
Row 1:
1. _ + 1 = 4: We need a number that, when added to 1, makes 4. Think: 4 minus 1 is 3. So, 3 + 1 = 4.
2. _ + 3 = 8: We need a number that, when added to 3, makes 8. Think: 8 minus 3 is 5. So, 5 + 3 = 8.
3. 3 + _ = 12: We need a number that, when added to 3, makes 12. Think: 12 minus 3 is 9. So, 3 + 9 = 12.
4. 8 + _ = 16: We need a number that, when added to 8, makes 16. Think: 16 minus 8 is 8. So, 8 + 8 = 16.
Row 2:
5. 7 + _ = 16: We need a number that, when added to 7, makes 16. Think: 16 minus 7 is 9. So, 7 + 9 = 16.
6. _ + 3 = 7: We need a number that, when added to 3, makes 7. Think: 7 minus 3 is 4. So, 4 + 3 = 7.
7. 1 + _ = 8: We need a number that, when added to 1, makes 8. Think: 8 minus 1 is 7. So, 1 + 7 = 8.
8. _ + 1 = 9: We need a number that, when added to 1, makes 9. Think: 9 minus 1 is 8. So, 8 + 1 = 9.
Row 3:
9. 2 + _ = 6: We need a number that, when added to 2, makes 6. Think: 6 minus 2 is 4. So, 2 + 4 = 6.
10. _ + 8 = 15: We need a number that, when added to 8, makes 15. Think: 15 minus 8 is 7. So, 7 + 8 = 15.
11. 4 + _ = 5: We need a number that, when added to 4, makes 5. Think: 5 minus 4 is 1. So, 4 + 1 = 5.
12. 9 + _ = 15: We need a number that, when added to 9, makes 15. Think: 15 minus 9 is 6. So, 9 + 6 = 15.
Row 4:
13. _ + 8 = 9: We need a number that, when added to 8, makes 9. Think: 9 minus 8 is 1. So, 1 + 8 = 9.
14. 3 + _ = 8: We need a number that, when added to 3, makes 8. Think: 8 minus 3 is 5. So, 3 + 5 = 8.
15. 4 + _ = 5: We need a number that, when added to 4, makes 5. Think: 5 minus 4 is 1. So, 4 + 1 = 5.
16. _ + 9 = 16: We need a number that, when added to 9, makes 16. Think: 16 minus 9 is 7. So, 7 + 9 = 16.
Row 5:
17. 5 + _ = 6: We need a number that, when added to 5, makes 6. Think: 6 minus 5 is 1. So, 5 + 1 = 6.
18. 6 + _ = 14: We need a number that, when added to 6, makes 14. Think: 14 minus 6 is 8. So, 6 + 8 = 14.
19. 6 + _ = 13: We need a number that, when added to 6, makes 13. Think: 13 minus 6 is 7. So, 6 + 7 = 13.
20. _ + 5 = 7: We need a number that, when added to 5, makes 7. Think: 7 minus 5 is 2. So, 2 + 5 = 7.
Row 6:
21. _ + 8 = 17: We need a number that, when added to 8, makes 17. Think: 17 minus 8 is 9. So, 9 + 8 = 17.
22. _ + 7 = 15: We need a number that, when added to 7, makes 15. Think: 15 minus 7 is 8. So, 8 + 7 = 15.
23. _ + 5 = 7: We need a number that, when added to 5, makes 7. Think: 7 minus 5 is 2. So, 2 + 5 = 7.
24. 4 + _ = 11: We need a number that, when added to 4, makes 11. Think: 11 minus 4 is 7. So, 4 + 7 = 11.
Row 7:
25. _ + 7 = 10: We need a number that, when added to 7, makes 10. Think: 10 minus 7 is 3. So, 3 + 7 = 10.
26. _ + 1 = 9: We need a number that, when added to 1, makes 9. Think: 9 minus 1 is 8. So, 8 + 1 = 9.
27. _ + 6 = 12: We need a number that, when added to 6, makes 12. Think: 12 minus 6 is 6. So, 6 + 6 = 12.
28. _ + 2 = 9: We need a number that, when added to 2, makes 9. Think: 9 minus 2 is 7. So, 7 + 2 = 9.
Row 8:
29. 3 + _ = 10: We need a number that, when added to 3, makes 10. Think: 10 minus 3 is 7. So, 3 + 7 = 10.
30. _ + 8 = 10: We need a number that, when added to 8, makes 10. Think: 10 minus 8 is 2. So, 2 + 8 = 10.
31. 2 + _ = 9: We need a number that, when added to 2, makes 9. Think: 9 minus 2 is 7. So, 2 + 7 = 9.
32. _ + 3 = 10: We need a number that, when added to 3, makes 10. Think: 10 minus 3 is 7. So, 7 + 3 = 10.
Row 9:
33. 1 + _ = 10: We need a number that, when added to 1, makes 10. Think: 10 minus 1 is 9. So, 1 + 9 = 10.
34. _ + 3 = 8: We need a number that, when added to 3, makes 8. Think: 8 minus 3 is 5. So, 5 + 3 = 8.
35. _ + 6 = 11: We need a number that, when added to 6, makes 11. Think: 11 minus 6 is 5. So, 5 + 6 = 11.
36. _ + 6 = 10: We need a number that, when added to 6, makes 10. Think: 10 minus 6 is 4. So, 4 + 6 = 10.
Row 10:
37. 8 + _ = 15: We need a number that, when added to 8, makes 15. Think: 15 minus 8 is 7. So, 8 + 7 = 15.
38. _ + 8 = 14: We need a number that, when added to 8, makes 14. Think: 14 minus 8 is 6. So, 6 + 8 = 14.
39. 8 + _ = 9: We need a number that, when added to 8, makes 9. Think: 9 minus 8 is 1. So, 8 + 1 = 9.
40. _ + 7 = 15: We need a number that, when added to 7, makes 15. Think: 15 minus 7 is 8. So, 8 + 7 = 15.
Final Answer:
Here are the missing numbers for each equation, listed row by row from left to right:
Row 1: 3, 5, 9, 8
Row 2: 9, 4, 7, 8
Row 3: 4, 7, 1, 6
Row 4: 1, 5, 1, 7
Row 5: 1, 8, 7, 2
Row 6: 9, 8, 2, 7
Row 7: 3, 8, 6, 7
Row 8: 7, 2, 7, 7
Row 9: 9, 5, 5, 4
Row 10: 7, 6, 1, 8
The rule is simple: Part + Part = Whole.
If we know the Whole and one Part, we can find the missing Part by subtracting.
Whole - Known Part = Missing Part.
Let's go row by row, from left to right.
Row 1:
1. _ + 1 = 4: We need a number that, when added to 1, makes 4. Think: 4 minus 1 is 3. So, 3 + 1 = 4.
2. _ + 3 = 8: We need a number that, when added to 3, makes 8. Think: 8 minus 3 is 5. So, 5 + 3 = 8.
3. 3 + _ = 12: We need a number that, when added to 3, makes 12. Think: 12 minus 3 is 9. So, 3 + 9 = 12.
4. 8 + _ = 16: We need a number that, when added to 8, makes 16. Think: 16 minus 8 is 8. So, 8 + 8 = 16.
Row 2:
5. 7 + _ = 16: We need a number that, when added to 7, makes 16. Think: 16 minus 7 is 9. So, 7 + 9 = 16.
6. _ + 3 = 7: We need a number that, when added to 3, makes 7. Think: 7 minus 3 is 4. So, 4 + 3 = 7.
7. 1 + _ = 8: We need a number that, when added to 1, makes 8. Think: 8 minus 1 is 7. So, 1 + 7 = 8.
8. _ + 1 = 9: We need a number that, when added to 1, makes 9. Think: 9 minus 1 is 8. So, 8 + 1 = 9.
Row 3:
9. 2 + _ = 6: We need a number that, when added to 2, makes 6. Think: 6 minus 2 is 4. So, 2 + 4 = 6.
10. _ + 8 = 15: We need a number that, when added to 8, makes 15. Think: 15 minus 8 is 7. So, 7 + 8 = 15.
11. 4 + _ = 5: We need a number that, when added to 4, makes 5. Think: 5 minus 4 is 1. So, 4 + 1 = 5.
12. 9 + _ = 15: We need a number that, when added to 9, makes 15. Think: 15 minus 9 is 6. So, 9 + 6 = 15.
Row 4:
13. _ + 8 = 9: We need a number that, when added to 8, makes 9. Think: 9 minus 8 is 1. So, 1 + 8 = 9.
14. 3 + _ = 8: We need a number that, when added to 3, makes 8. Think: 8 minus 3 is 5. So, 3 + 5 = 8.
15. 4 + _ = 5: We need a number that, when added to 4, makes 5. Think: 5 minus 4 is 1. So, 4 + 1 = 5.
16. _ + 9 = 16: We need a number that, when added to 9, makes 16. Think: 16 minus 9 is 7. So, 7 + 9 = 16.
Row 5:
17. 5 + _ = 6: We need a number that, when added to 5, makes 6. Think: 6 minus 5 is 1. So, 5 + 1 = 6.
18. 6 + _ = 14: We need a number that, when added to 6, makes 14. Think: 14 minus 6 is 8. So, 6 + 8 = 14.
19. 6 + _ = 13: We need a number that, when added to 6, makes 13. Think: 13 minus 6 is 7. So, 6 + 7 = 13.
20. _ + 5 = 7: We need a number that, when added to 5, makes 7. Think: 7 minus 5 is 2. So, 2 + 5 = 7.
Row 6:
21. _ + 8 = 17: We need a number that, when added to 8, makes 17. Think: 17 minus 8 is 9. So, 9 + 8 = 17.
22. _ + 7 = 15: We need a number that, when added to 7, makes 15. Think: 15 minus 7 is 8. So, 8 + 7 = 15.
23. _ + 5 = 7: We need a number that, when added to 5, makes 7. Think: 7 minus 5 is 2. So, 2 + 5 = 7.
24. 4 + _ = 11: We need a number that, when added to 4, makes 11. Think: 11 minus 4 is 7. So, 4 + 7 = 11.
Row 7:
25. _ + 7 = 10: We need a number that, when added to 7, makes 10. Think: 10 minus 7 is 3. So, 3 + 7 = 10.
26. _ + 1 = 9: We need a number that, when added to 1, makes 9. Think: 9 minus 1 is 8. So, 8 + 1 = 9.
27. _ + 6 = 12: We need a number that, when added to 6, makes 12. Think: 12 minus 6 is 6. So, 6 + 6 = 12.
28. _ + 2 = 9: We need a number that, when added to 2, makes 9. Think: 9 minus 2 is 7. So, 7 + 2 = 9.
Row 8:
29. 3 + _ = 10: We need a number that, when added to 3, makes 10. Think: 10 minus 3 is 7. So, 3 + 7 = 10.
30. _ + 8 = 10: We need a number that, when added to 8, makes 10. Think: 10 minus 8 is 2. So, 2 + 8 = 10.
31. 2 + _ = 9: We need a number that, when added to 2, makes 9. Think: 9 minus 2 is 7. So, 2 + 7 = 9.
32. _ + 3 = 10: We need a number that, when added to 3, makes 10. Think: 10 minus 3 is 7. So, 7 + 3 = 10.
Row 9:
33. 1 + _ = 10: We need a number that, when added to 1, makes 10. Think: 10 minus 1 is 9. So, 1 + 9 = 10.
34. _ + 3 = 8: We need a number that, when added to 3, makes 8. Think: 8 minus 3 is 5. So, 5 + 3 = 8.
35. _ + 6 = 11: We need a number that, when added to 6, makes 11. Think: 11 minus 6 is 5. So, 5 + 6 = 11.
36. _ + 6 = 10: We need a number that, when added to 6, makes 10. Think: 10 minus 6 is 4. So, 4 + 6 = 10.
Row 10:
37. 8 + _ = 15: We need a number that, when added to 8, makes 15. Think: 15 minus 8 is 7. So, 8 + 7 = 15.
38. _ + 8 = 14: We need a number that, when added to 8, makes 14. Think: 14 minus 8 is 6. So, 6 + 8 = 14.
39. 8 + _ = 9: We need a number that, when added to 8, makes 9. Think: 9 minus 8 is 1. So, 8 + 1 = 9.
40. _ + 7 = 15: We need a number that, when added to 7, makes 15. Think: 15 minus 7 is 8. So, 8 + 7 = 15.
Final Answer:
Here are the missing numbers for each equation, listed row by row from left to right:
Row 1: 3, 5, 9, 8
Row 2: 9, 4, 7, 8
Row 3: 4, 7, 1, 6
Row 4: 1, 5, 1, 7
Row 5: 1, 8, 7, 2
Row 6: 9, 8, 2, 7
Row 7: 3, 8, 6, 7
Row 8: 7, 2, 7, 7
Row 9: 9, 5, 5, 4
Row 10: 7, 6, 1, 8
Parent Tip: Review the logic above to help your child master the concept of missing numbers addition worksheet.
