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Calculating Area

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Mina D'Aniello
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38 views2 pages

Calculating Area

Uploaded by

Mina D'Aniello
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Border areas

Calculate the shaded areas

1. 2. 3.

5cm
7cm
5cm

3.5cm

4cm
6cm

10cm

4cm

9cm
14cm
7cm

8cm

4. 5. 6.

9cm 2cm
3cm

5cm
6cm 5cm
4cm

6cm

4cm
15cm

10cm
5.5cm

7cm

9cm
3cm

4cm
6cm
4cm

11cm
7cm

7. All 4 rectangles are 8. All 4 rectangles are 9. All 4 triangles cut off the
identical identical square are identical
2cm

3cm

7cm

10cm
9cm 15cm

© www.teachitmaths.co.uk 2016 26668 Page 1 of 2


Border areas
Answers

Some suggested methods

1. 80 - 30 = 50 cm2

2. 70 - 28 = 42 cm2

3. 63 - 14 = 49 cm2

4. 135 - 48 = 87 cm2

5. 143 - 15 - 18 - 22 = 143 - 55 = 88 cm2

6. 98 - 28 - 12.5 = 98 - 40.5 = 57.5 cm2

7. 5 x 5 = 25 cm2 or 81 - 4(14) = 81 - 56 = 25 cm2

8. 7 x 7 = 49 cm2 or 169 - 4(30) = 169 - 120 = 49 cm2

9. 225 - 49 - 4(8) = 225 - 81 = 144 cm2 or 4(28) + 4(8) = 112 + 32 = 144 cm2

© www.teachitmaths.co.uk 2016 26668 Page 2 of 2

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