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alternative strategies
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43 + 56
40 + 50 = 90
3 + 6 = 9
90 + 9 =
99
split strategy
35 + 12
12 = 5 + 7
35 +
5
= 40
40 +
7
= 47
jump strategy
500-123 = 499-122
499
-122
377
take a penny
324 + 62
320 + 60 = 380
4 + 2 = 6
380 + 6 =
386
split strategy
498 + 163
498 +
2
= 500
163 -2 = 161
500 + 161 =
661
jump strategy
$5.00 - $1.48 = $4.99 - $1.47
$4.99
-$1.47
$3.52
take a penny
Author
Anonymous
ID
29344
Card Set
alternative strategies
Description
cards with alternative addition and subtraction strategies
Updated
2010-08-09T02:11:41Z
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