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Anonymous
on FreezingBlue Flashcards.
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43 + 56
40 + 50 = 90
3 + 6 = 9
90 + 9 = 99
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35 + 12
12 = 5 + 7
35 + 5 = 40
40 + 7 = 47
jump strategy
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500-123 = 499-122
499
-122
377
take a penny
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324 + 62
320 + 60 = 380
4 + 2 = 6
380 + 6 = 386
split strategy
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498 + 163
498 + 2 = 500
163 -2 = 161
500 + 161 = 661
jump strategy
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$5.00 - $1.48 = $4.99 - $1.47
$4.99
-$1.47
$3.52
take a penny
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