Practice Questions

Question 1

0.043 x ___ = 430. Fill the blank.

Answer 1

10,000

Question 2

If 3.4 x 23.4 = 79.56, what is 34 x 23.4 = ?

Answer 2

795.6

Question 3

Heather weighs 48.6kg, every two days she eats she eats a chocolate bar with a mass of 225g, how many days until Heather will eat her own weight in chocolate bars?

Answer 3

48.6 kgs is 48,600g, 48,600 divided by 225 is 216, so 216 chocolate bars, she eats one every two days so 432 days.

Question 4

estimate if a group of 29 women with a mean weight of 58.3 kg, would weigh more than a group of 21 men with the mean weight of 78.6, write your estimation with the answer.

Answer 4

30 x 60 (rounded) = 1800
22 x 80 (rounded) = 1700
The men have eight fewer people, and each man weighs around 20kgs more than a woman, 20 x 8 = 160 for every extra woman they have 160kgs, 60 x 8 = 480, so 8 women weighing roughly 60kgs each weighs a lot more than 160kgs. The women weigh more.

Question 4

estimate if a group of 29 women with a mean weight of 58.3 kg, would weigh more than a group of 21 men with the mean weight of 78.6, write your estimation with the answer.

Answer 4

30 x 60 (rounded) = 1800
22 x 80 (rounded) = 1700
The men have eight fewer people, and each man weighs around 20kgs more than a woman, 20 x 8 = 160

Question 5

List all the factors of 36.

Answer 5

1, 2, 3, 4, 6, 9, 12, 18, 36

Question 6

Use a factor tree to write the prime factors of 126.

Answer 6

Ans: 3, 3, 7, 2

Question 7

Round 3657 to 1 sf

Answer 7

4000.