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