Lesson 4 of 8 · Grade 1
Make 10 to add
To add 8 + 5, fill a ten first. Then add what is left.
Step 1
Learn it
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Fill the ten
8 + 5. The frame has 8. It needs 2 more to be full.
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Split the 5
Take 2 from the 5. That leaves 3.
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Add the rest
The frame is full: 10. Now 10 + 3 = 13.
Step 2
Watch how
Two examples, worked out one step at a time.
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8 + 5 = ?
8 needs 2 to make 10. Split 5 into 2 and 3. 8 + 2 = 10. 10 + 3 = 13.
Answer: 13 -
9 + 4 = ?
9 needs 1 to make 10. Split 4 into 1 and 3. 9 + 1 = 10. 10 + 3 = 13.
Answer: 13
Step 3
Play with it
Tap the boxes to fill them. How many more make 10?
Step 4
Practice
Five questions. Think first. Then tap Show answer.
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9 + 2 = ?
Show answer
11
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8 + 4 = ?
Show answer
12
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7 + 5 = ?
Show answer
12
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9 + 6 = ?
Show answer
15
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8 + 7 = ?
Show answer
15