Crossing the tens boundary counting forwards and backwards | Exit Quiz | Oak National Academy

Aisha starts counting at 49 and finishes at 54. She must be counting __________.

• forwards

• backwards

Answer explanation

The numbers are becoming greater, so she must be counting forwards.

When counting backwards from 60, which of these numbers would come first in the count?

• 37

• 47

• 57

Answer explanation

When counting backwards, you say the fifties first, then the forties then the thirties, so you would say 57 first.

Lucas is counting forwards from a number ending in 9. What was the number he started at?

• 29

• 49

• 39

Answer explanation

He counted 39, 40, 41, 42.

Aisha is counting backwards from a decade number. What was the decade number she started at?

• 60

• 50

• 70

Answer explanation

She must have started counting at 70 and counted 70, 69, 68, 67.

Lucas is counting forwards from 45. What is the next decade number he will say?

• 40

• 50

• 60

Answer explanation

He would count 46, 47, 48, 49, 50, or you may have remembered that the decade number 50 comes after the forties.

Aisha is counting backwards from 45. What is the next decade number she will say?

• 40

• 50

• 30

Answer explanation

If she counted back from 45, she would count 44, 43, 42, 41, 40.