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Thursday, 24 March 2016

reflection week 8


This is one of my numeracy follow up's for this week. My 2 WALTs were to  use multiplication knowledge and strategy to solve problems. I used doubling and halving to solve multiplication problems.


Multiplication Strategy: Doubling and Halving


We can simplify some multiplication problems using doubling and halving.


1. Use the strategy of doubling one factor and halving the other to help simplify and solve the following problems: Example: 5 x 16 = 10 x 8 = 80 or 5 x 16 = 10 x 8 = 20 x 4 = 80


a) 5 x 68 =   340


b) 3 x 16 =  24


c) 16 x 30 =  480


d) 18 x 40 = 180


e) 35 x 20 =  700


f) 25 x 16 = 400


g) 50 x 24 = 120


h) 500 x 28 = 14,000


2. Does this strategy always work?

Explain when the strategy of doubling and halving is useful to simplify a multiplication problem. No if  both numbers are odd numbers but it is helpful
This is what I did for my reading follow up. My WALT  was comprehend what we read.

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