Marking Term 2

Areas

1.a 15 x 19 = (15 x 20) - (15 x 1)

= 300 - 15 = 285m²

Lengths from areas and widths

2a. 224m² 7m

= 224 ÷ 7 = 7 x __ = 224

7 x 30 = 210

7 x 2 = 14

7 x 32 = 224m² Length = 32m

Perimeters

3a. 39.7 25.26

= (40 - .3) + (40 - .3) = 80 - 0.6 = 79.4

+ (25 + 25) = 50 + .26 + 26

= 50 + .52 = 50.52

= 79.4 + 50.52 = 129.92m

Areas

1b. 16 x 28 = (16 x 20) - (16 x 2)

320 - 32 = 288m²

Areas

1c. 13 x 51 = (13 x 50) + (13 x 1)

650 = 13 = 663m²

Areas

1d. 9 x 43 = (10 x 43) - (1 x 43)

= 430 - 43 - 387m²

Lengths from areas and widths

Lengths from areas and widths

Lengths from areas and widths

2b. 336m² 8m

=336 ÷ 8 = 8 x __ = 336

= 8 x 40 = 320

= 8 x 2 = 16

= 8 x 42 = 336m²

2c. 612m² 6

= 612 ÷ 6 = 6 x ___ = 612

= 6 x 100 = 600

= 6 x 2 = 12

= 6 x 102 = 612m²

2d. 275m² 5m

= 275 ÷ 5 = 5 x ___ = 275

= 5 x 50 = 250

= 5 x 5 = 25

= 5 x 55 = 275m²

Perimeters

3b.198.7 26.45

= 200 + 200 = 400 - 2.6 =397.4

+ 26 + 26 = 52 + .45 + 45 = .9

= 397.4 + 52.9

= (397.4 + 2.6) + (52.9 - 2.6)

= 400 + 50.3 = 450.3m

Perimeters

Perimeters

Length from perimeter and width

3c. 256.38 97.9

= 256 + 256 = 512 + (.38 + .38)

= 512 + .76 = 512.76

+ 100 + 100 = 200 - 4.2

= 195.8 + 512.76

= (195.8 + 4.2) + (512.76 - 4.2)

= 200 + 508.56 = 708.56m

3d. 160.29 49.8

= 160 + 160 = 320 + .29 + .29

= 320 + .58 = 320.58

+

50 + 50 = 100 - 0.4

= (320.58 + 100) - 0.4

= 420.58 - 0.4

= 420.18m