One less with manipulatives and counting | Maths | Quizalize & Oak National Academy

Starter quiz

This card shows the number 6. Which picture shows one more than 6 bricks?
Choose the correct number to complete this sentence. One more than 7 is ______

1

8 ✓

7
Which number card shows one more than the number of counters in the picture?
Which is the correct sentence to match this picture?

The number marked on the track is one more than 7

The number marked on the track is one more than 8 ✓

The number marked on the track is one more than 9
Are these numbers in the correct order for counting backwards?

True
False ✓
Which numbers are in the wrong order in the cards?

8 and 7

7 and 6 ✓

6 and 5

There were 4 cars and one drove away. Which picture shows one fewer than 4 cars?
Which beads show one less than 5?
This is the number 7. Which counters show one less than 7 counters?
This is the number one. Which counters show 1 more than 1?
Which number track has the arrow over the number that is one less than 8?
True or false: The number before 7 is 8 so one less than 7 is 8.

True
False ✓

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Secure understanding of one less as the number before.
Use a variety of manipulatives and the stem sentence to deepen understanding that the number before is one less than .
Answer questions such as 'What number comes before 5 when counting?'

Pupils may start counting on the number given and not recognise that the number before is one less.

Model counting back and highlight the number before alongside the manipulatives. Give opportunities for pupils to remove one from a set.

One less than - One less than is when there is a smaller value by one.
One fewer than - One fewer than is when there is a smaller quantity by one or one has been removed from the set.
Number before - When counting, the number before is the one that comes before a given number.