The Flip Trick!
Kit has red blocks and blue blocks. Can she flip them and add? Let us see!
1st Grade MathStep 1: Add Them Up
Kit has 3 blocks and 5 blocks. Add them. 3 + 5 = ?
3 + 5 = 8. The sum is 8.
Count on from 3: 4, 5, 6, 7, 8!
Step 2: Flip It!
Kit flips them! Now it is 5 + 3. What is 5 + 3?
5 + 3 = 8. Flip it, and the sum is the same! 3 + 5 is
equal to 5 + 3.
Two Big Tricks
Kit's Tricks
Flip trick: 3 + 5 = 8 and 5 + 3 = 8.
The sum is the same!
Ten trick: To add 3 numbers, make a ten first.
8 + 2 + 5? Do 8 + 2 = 10. Then 10 + 5 = 15!
The sum is the same!
Ten trick: To add 3 numbers, make a ten first.
8 + 2 + 5? Do 8 + 2 = 10. Then 10 + 5 = 15!
Kit
Flip it or make a ten. It helps me add fast!
Fill It In!
4 + 2 = 6 so 2 + 4 = ?
Use the flip trick!
2 + 4 = 6. If you know 4 + 2 = 6, you know 2 + 4 = 6. Flip it!
Shell Time!
Sam has 7 shells. Meg has 2 shells. How many shells in all?
7 + 2 = 9. Start at 7 and count on: 8, 9!
Take It Back!
3 + 5 = 8 so 8 - 5 = ?
Use what you know to subtract!
8 - 5 = 3. It is a fact family: 3 + 5 = 8, 5 + 3 = 8, 8 - 5 = 3!
Which One Is the Same?
Which is equal to 6 + 3?
6 + 3 = 9 and 3 + 6 = 9. Flip it! The sum is the same.
Make a Ten!
8 + 2 + 5 = ?
Add 8 + 2 first. Then add 5!
8 + 2 = 10. Then 10 + 5 = 15. Make a ten first, and it is fast!
Big Kid Test!
2 + 6 + 4 = ?
Hint: two numbers can make a ten!
6 + 4 = 10. Then 2 + 10 = 12. You made a ten!
Think About It
When can the flip trick help you add fast? Tell a friend!
Great Work!
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add
subtract
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fact family
count on