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

ID

29344

Card Set

alternative strategies

Description

cards with alternative addition and subtraction strategies

Updated

2010-08-09T02:11:41Z

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