Starter quiz
- When does the pattern of counting change when counting backwards?
- when you cross the tens boundary ✓
- when you count the forties
-
- I'm thinking of a number. It is in the fifties and ends in 6. What is my number?
- 65
- 56 ✓
- 506
-
- Sort these numbers in the order you would say them if counting forwards.
- 1⇔5 tens 7
- 2⇔5 tens 8
- 3⇔5 tens 9
- 4⇔6 tens
- Lucas counts backwards from the number 76. What numbers will he say next?
- 75, 74, 73 ✓
- 77, 78, 79
-
- When counting forwards from 34, which of these numbers will you say?
- 29
- 43 ✓
- 34
-
- When counting backwards from 34, which of these numbers will you say?
- 29 ✓
- 35
- 43
-
Exit quiz
- Aisha starts counting at 49 and finishes at 54. She must be counting __________.
- forwards ✓
- backwards
-
- When counting backwards from 60, which of these numbers would come first in the count?
- 37
- 47
- 57 ✓
-
Lucas is counting forwards from a number ending in 9. What was the number he started at?- 29
- 49
- 39 ✓
-
Aisha is counting backwards from a decade number. What was the decade number she started at?- 60
- 50
- 70 ✓
-
- Lucas is counting forwards from 45. What is the next decade number he will say?
- 40
- 50 ✓
- 60
-
- Aisha is counting backwards from 45. What is the next decade number she will say?
- 40 ✓
- 50
- 30
-
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- The numbers from 0 to 100 have patterns that can help us to count forwards and backwards across the tens boundary.
- They are arranged differently on a number track and on a one hundred square.
- We can count the numbers in two ways.
- When a number ends in a 9, it is always followed by a decade number when counting in ones.
Common misconception
Confusion around the numbers which cross the tens boundary, e.g. 39, 40 may say 39, 30
Make errors for the children to discuss; encourage them to explain and correct mistakes.
Keywords
Cross the tens boundary - The point at which the counting moves from one decade into another.
Forwards - When you count forwards the number become greater.
Backwards - When you count backwards the number become less.
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