N3: Four Operations Topic Check

 $10.6-3.41\ =\$  

(a)  

1484.1 + 10.82

(a)  

16 x 22

(a)  

791 ÷ 7

(a)  

List all of the additions and subtractions fact family that the bar model shows. Click each one that is true.

• 16.4 + 10.5 = 26.9

• 26.9 - 10.5 = 16.4

• 10.5 + 16.4 = 26.9

• 16.4 - 10.5 = 26.9

• 26.9 - 16.4 = 10.5

Click the correct answer of

10 – 5 + 3

• 2

• 8

Using the commutative and associative properties, explain an efficient way to calculate.

0.8 + 17 + 0.2 + 23 + 1

Then work out the answer. Click the correct explanation and answer.

• 42.8

• 42

• 32

• The commutative property changes the order of the additions and the associative property groups numbers to find number bonds and makes the calculation easier.

• The commutative property groups numbers to find number bonds and the associative property changes the order of the additions and makes the calculation easier.

Calculate 5 x 18 using the adjustment method: Click your method and answer

• method 10 x 9

• method 5 x 10 + 5 x 8

• 180

• 90

Click all calculations which have the same answer as

193 – 34.

• 194 – 35

• 190 – 31

• 200 – 41

• 193 – 30 – 4

• 197 - 30

Click the symbol ≠ or = in each box to make the statements correct.

• $\ne$

• $=$