Let’s solve each problem one by one. We’ll find the missing number in each equation by using basic math: addition, subtraction, multiplication, or division — whatever is needed to make the equation true.
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1. □ + 96 = 302
To find the missing number, subtract 96 from 302:
302 - 96 =
206
2. 372 + □ = 589
Subtract 372 from 589:
589 - 372 =
217
3. 17.8 + □ = 64
Subtract 17.8 from 64:
64 - 17.8 =
46.2
4. □ + 13.6 = 36.1
Subtract 13.6 from 36.1:
36.1 - 13.6 =
22.5
5. □ - 317 = 508
Add 317 to 508:
508 + 317 =
825
6. 1074 - □ = 413
Subtract 413 from 1074:
1074 - 413 =
661
7. 67.3 - □ = 48.5
Subtract 48.5 from 67.3:
67.3 - 48.5 =
18.8
8. □ - 34.7 = 86.8
Add 34.7 to 86.8:
86.8 + 34.7 =
121.5
9. □ × 31 = 1736
Divide 1736 by 31:
1736 ÷ 31 =
56
10. 26 × □ = 988
Divide 988 by 26:
988 ÷ 26 =
38
11. 2.5 × □ = 11.75
Divide 11.75 by 2.5:
11.75 ÷ 2.5 =
4.7
12. □ × 8.3 = 28.22
Divide 28.22 by 8.3:
28.22 ÷ 8.3 =
3.4
13. □ + 56 = 47
Subtract 56 from 47:
47 - 56 =
-9
14. 646 ÷ □ = 34
Divide 646 by 34:
646 ÷ 34 =
19
15. 86.7 + □ = 10.2
Subtract 86.7 from 10.2:
10.2 - 86.7 =
-76.5
16. □ + 3.9 = 6.7
Subtract 3.9 from 6.7:
6.7 - 3.9 =
2.8
17. 347 + □ = 628
Subtract 347 from 628:
628 - 347 =
281
18. □ - 161 = 557
Add 161 to 557:
557 + 161 =
718
19. 34 × □ = 2006
Divide 2006 by 34:
2006 ÷ 34 =
59
20. 391 + □ = 23
Subtract 391 from 23:
23 - 391 =
-368
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Final Answer:
1. 206
2. 217
3. 46.2
4. 22.5
5. 825
6. 661
7. 18.8
8. 121.5
9. 56
10. 38
11. 4.7
12. 3.4
13. -9
14. 19
15. -76.5
16. 2.8
17. 281
18. 718
19. 59
20. -368
Parent Tip: Review the logic above to help your child master the concept of printable worksheets ks3 maths.
