Lesson 5 of 8 · Grade 1
Doubles and near doubles
A double adds a number to itself. A near double is one more or one less.
Step 1
Learn it
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Doubles
3 + 3 = 6. 4 + 4 = 8. 5 + 5 = 10. Two equal groups.
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Near doubles
6 + 7 is one more than 6 + 6.
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Double, then adjust
6 + 6 = 12. One more is 13. So 6 + 7 = 13.
Step 2
Watch how
Two examples, worked out one step at a time.
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7 + 8 = ?
7 + 7 = 14. 8 is one more than 7, so add 1: 15.
Answer: 15 -
9 + 9 = ?
A double. 9 + 9 = 18.
Answer: 18
Step 3
Practice
Five questions. Think first. Then tap Show answer.
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4 + 4 = ?
Show answer
8
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6 + 6 = ?
Show answer
12
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8 + 8 = ?
Show answer
16
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5 + 6 = ?
Show answer
11
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7 + 6 = ?
Show answer
13