What Goes in the Box?
Hen has 8 eggs. She needs 11 eggs. Can you help her?
1st Grade MathStep 1: Hop Up the Line
Hen has 8 eggs. She needs 11. Count on from 8. How many hops to 11?
8 + ? = 11
Count on from 8: 9, 10, 11. That is 3 hops! So 8 + 3 = 11.
Step 2: Check It!
Add the 8 eggs and the 3 eggs. What is the sum?
8 + 3 = ?
8 + 3 = 11. The sum is 11. Hen gets her 11 eggs!
Let's Remember
Find the Lost Number
Step 1: Read the math fact.
Step 2: Count on or count back.
Step 3: Check it! Both sides must be the same.
Step 2: Count on or count back.
Step 3: Check it! Both sides must be the same.
Hen says:
The = sign is like a see-saw. Both sides must match!
Add It Up!
6 + 6 = ?
6 + 6 = 12. The sum of 6 and 6 is 12.
What Goes in the Blank?
? + 4 = 9
A number plus 4 is 9. What is the number?
5 + 4 = 9. Count on from 4: 5, 6, 7, 8, 9. That is 5 hops.
The Lost Number
5 = ? − 3
A number lost 3. Now it is 5. What was it?
8 − 3 = 5. Add to check: 5 + 3 = 8. It works!
Word Problem
Cat has 12 fish. She ate some fish. Now she has 7 fish. How many fish did she eat?
12 − ? = 7
Cat ate 5 fish. Count back from 12: 11, 10, 9, 8, 7. 12 − 5 = 7.
Subtract!
Start with 10. Subtract some. Now you have 4.
10 − ? = 4
10 − 6 = 4. Count back from 10: 9, 8, 7, 6, 5, 4. That is 6.
The Big Test!
6 + 4 = ? + 7
Both sides must be the same. What goes in the box?
6 + 4 = 10. And 3 + 7 = 10. Both sides are the same!
When could you count on to help you? Tell a pal!
Great Work!
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