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12 Cards in this Set
- Front
- Back
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34+5=? Show your work.
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34+5= 30+4+5= 30+9=39
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25+61=? Show your work.
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25+61= 20+60+5+1= 80+6= 86
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58+27=? Show your work.
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58+27= 50+20+8+7= 70+15= 70+10+5= 80+5= 85
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10+47=? Show your work
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10+47= 10+40+7= 50+7= 57
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26+3=? Explain how you got your answer.
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29. I added 2 tens and 6 ones plus 3 ones, so I had 2 tens and 9 ones, which equals 29.
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50+26=? Explain how you got your answer.
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76. I added 5 tens and 0 ones plus 2 tens and 6 ones, so I had 7 tens and 6 ones, which equals 76.
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19+64=? Explain how you got your answer.
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83. I added 1 ten and 9 ones plus 6 tens and 4 ones so I had 7 tens and 13 ones. I had to make another group of ten so I added 7 tens plus 1 ten plus 3 ones which is 8 tens and 3 ones, which equals 83.
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What is 10 more than 25? Explain how you solved this in your head.
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35 because it is one more ten than 25 but the same number of ones.
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What is 10 less than 94? Explain how you solved this in your head.
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84 because it is one ten less than 94 but the same number of ones.
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What is 40-20? Explain how you solved this.
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20, because 4 tens minus 2 tens is 2 tens.
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What is 90-40? Explain how you solved this.
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50, because 9 tens minus 4 tens is 5 tens.
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What is 50-10? Explain how you solved this.
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40, because 5 tens minus 1 ten is 4 tens.
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