5.2 m

19 Estimate the square root of 160 100. Explain how you determined your estimate

160=40

100=10

40x10=400

17 Carmel want to mount an 18cm by 18cm square on a square board that is four times the area of the picture.

a) What is the area for the picture.

18x18=324cm2

b)What is the area of the board

324x4=1296cm2

c)What are the dimensions of the board.

1296=36cm

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