Page 114 - STEPS MATHEMATICS 4A

Doubling and halving

This rectangle is 4 cm long
and 3 cm wide.
Its area is 12 square centimetres.

Draw a rectangle of this length and width
on centimetre squared paper. Write its area underneath.
Double the length of each side and draw the larger rectangle.
Write its area underneath.

Repeat stages 1 and 2 for these rectangles. ,.

Do the same for rectangles of these lengths and widths.

a 4cm long, 4cm wide b 6cm long, 2cm wide
c 8cm long, 1 cm wide d 5 cm long, 4 cm wide

Look at your results, then complete this sentence to show what you think.
When you double the sides of a rectangle, the area ...

CHALLENGE

David doubled the sides of a rectangle so that its area became 96sqcm.
Draw the 4 different rectangles David might have started with.

I STEPS 4a:341