To solve these problems, we need to find the missing part. The big number on the left is the
Whole. The dots in the boxes are the
Parts.
The rule is:
Part + Part = Whole
Or, if you know the Whole and one Part, you can subtract:
Whole - Part = Missing Part
Let's go through each box step by step:
Row 1:
1.
Whole is 7. One part has 6 dots.
* Calculation: $7 - 6 = 1$
* Missing part:
1 dot
2.
Whole is 5. One part has 3 dots.
* Calculation: $5 - 3 = 2$
* Missing part:
2 dots
3.
Whole is 6. One part has 4 dots.
* Calculation: $6 - 4 = 2$
* Missing part:
2 dots
Row 2:
4.
Whole is 4. One part has 2 dots.
* Calculation: $4 - 2 = 2$
* Missing part:
2 dots
5.
Whole is 10. One part has 5 dots.
* Calculation: $10 - 5 = 5$
* Missing part:
5 dots
6.
Whole is 2. One part has 1 dot.
* Calculation: $2 - 1 = 1$
* Missing part:
1 dot
Row 3:
7.
Whole is 3. One part has 1 dot.
* Calculation: $3 - 1 = 2$
* Missing part:
2 dots
8.
Whole is 8. One part has 4 dots.
* Calculation: $8 - 4 = 4$
* Missing part:
4 dots
9.
Whole is 9. One part has 6 dots.
* Calculation: $9 - 6 = 3$
* Missing part:
3 dots
Final Answer:
Here are the number of dots needed for each empty box, going from left to right, top to bottom:
Row 1: 1, 2, 2
Row 2: 2, 5, 1
Row 3: 2, 4, 3
Parent Tip: Review the logic above to help your child master the concept of worksheet for first grader.
