Download - Which strategy fits best
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Which strategy fits
best?
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904 - 398
10 8 14 9
506
Algorithm
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Place Value Partitioning
506 + 398 = 506 + 300 = 806 806 + 90 = 896 896 + 8 = 904
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Reversing
904 – 398 = ?
398 + ? = 904
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904 – 398 =
906 – 400 = 506
+2 +2
Equal Adjustments
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Rounding and Compensating
506 + 398 =
(Compensating) (Rounding)
504 + 400 = 904
+2 -2
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Jumping up the number line
398 400 900 904
+2 +500
+4