7000195
Description
Flashcards by Екатерина Голубева, updated more than 1 year ago
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Created by Екатерина Голубева
about 8 years ago
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| Question | Answer |
| 25 + 5 = | 25 + 5 = (20 +5) +5 = 20 + (5 + 5) = 20 + 10 = 30 |
| 48 - 4 = | 48 - 4 = (40+8)-4 = 40 + (8 - 4) = 40+ 4 = 44 |
| 66 - 3 = | 66 - 3 = (60 + 6) - 3 = 60+(6 - 3) = 60+3 = 63 |
| 78 - 21 = | 78 - 21 = 78 - (20+1) = (78 - 20) - 1 =58 - 1 = 57 |
| 13 + 42 = 4 | 13 + 42 = 42+ (10+3) = (42+10) + 3 = 52+3 = 55 |
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