- Year 1
Crossing the tens boundary counting forwards
I can count forwards from 1 to 100, crossing the tens boundary
- Year 1
Crossing the tens boundary counting forwards
I can count forwards from 1 to 100, crossing the tens boundary
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Lesson details
Key learning points
- The numbers from 0 to 100 have patterns that can help us to count 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 whole number ends in a 9, it is always followed by a decade number.
Keywords
Tens boundary - This is where the pattern of counting changes at the start of the number to show a new decade has started.
Decade number - This is a multiple of 10 which marks the tens boundary where the pattern of counting changes.
Common misconception
Confusion between the number after 29, 39 etc. so saying 29,20 or twenty-none, twenty -ten.
Explicitly look at the numbers that follow a number ending in 9 using stem sentence to support.
To help you plan your year 1 maths lesson on: Crossing the tens boundary counting forwards, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 1 maths lesson on: Crossing the tens boundary counting forwards, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
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Prior knowledge starter quiz
6 Questions
Q1.Which of these rows from the one hundred square should come last when counting forwards?
Q2.Sam is counting the rows on the one hundred square backwards. They count the forties, the thirties. Which row will they say next?
Q3.Sort these numbers in the order you would say them when counting forwards along the row of the one hundred square.
Q4.Sort these numbers in the order you would say when counting backwards along the row of the one hundred square.
Q5.Sam is counting along the sixties row. Which number will they say next?
Q6.Numbers can be said in different ways. Match the numbers to the correct way to say it.
3 tens 5
5 tens 3
2 tens 8
8 tens 2
Assessment exit quiz
6 Questions
Q1.On the one hundred square, a number ending in a 9 is always followed by a __________.
Q2.Match the rows on the one hundred square to the correct decade numbers on that row.
40
50
60
Q3.Lucas is counting forwards and taps this number on his Gattegno chart. What number will he tap next?
Q4.Andeep is counting. What number will he say next?
Q5.When counting forwards, which counting sequence is correct?
Q6.Look at the picture. I’m thinking of a number that ends in 4. When I count forwards, I say it after 40. What is my number?