which strategy fits best

7

Click here to load reader

Upload: danielle-tepania

Post on 02-Jul-2015

4.688 views

Category:

Education


1 download

TRANSCRIPT

Page 1: Which strategy fits best

Which strategy fits

best?

Page 2: Which strategy fits best

904 - 398

10 8 14 9

506

Algorithm

Page 3: Which strategy fits best

Place Value Partitioning

506 + 398 = 506 + 300 = 806 806 + 90 = 896 896 + 8 = 904

Page 4: Which strategy fits best

Reversing

904 – 398 = ?

398 + ? = 904

Page 5: Which strategy fits best

904 – 398 =

906 – 400 = 506

+2 +2

Equal Adjustments

Page 6: Which strategy fits best

Rounding and Compensating

506 + 398 =

(Compensating) (Rounding)

504 + 400 = 904

+2 -2

Page 7: Which strategy fits best

Jumping up the number line

398 400 900 904

+2 +500

+4