Four Operations

A packet of stickers costs $1.75.

Round the cost of the packet of stickers to the nearest dollar

and estimate the cost of 5 packets of stickers

• $5

• $10

• $2

• $1

By rounding each number to the nearest whole number, estimate the value of the following.

Show your working

3.0 × 3.2 + 2.0 × (7.5 + 0.8)

• 3 x 3 + 2 x (8 + 1) = 63

• 3.0 x 3.2 + 2.0 x (7.5 + 0.8)

  = 79.32

  = 79

• 3 x 3 + 2 x (8 + 0.8) = 27

• 3 x 3 + 2 x (8 + 1) = 27

Evaluate the following.

6 + (-5)

• 6 - 5 = 1

• 6 + 5 = 11

• 6 - 5 = -1

• 6 + 5 = 1

Evaluate the following.

7 - (-2)

• 7 - 2 = 5

• 7 + 2 = 9

• 7 - 2 = 9

• 7 + 2 = 5

Evaluate the following.

5 - (-7)

• 5 - 7 = 2

• 5 - 7 = -2

• 5 + 7 = 12

• -5 + 7 = 2

Evaluate the following.

7 x (-2)

• 14

• 9

• -14

• 5

• 3

• -3

• -12

• -6

• 6

• -6

• -1

• 1

Find the value of the following.

10 + 4 × (5 – 3)

• 10 + 4 x 2

  = 14 x 2

  = 28

• 14 x (5 -3)

  = 14 + 2

  = 16

• 10 + 4 x 2

  = 10 + 8

  = 18

• 10 + 4 x 2

  = 42