One more than is when there is a greater amount by one or another item in the set.

One less than is when there is a smaller value by one.

To find a value that is close enough to the right answer, usually with some careful thought involved.

Explain that the digits in the numbers 11 to 19 express position on a number line

Maths

In this unit pupils will explain 11-19 as cardinal and ordinal numbers. They will double and halve numbers 6-9 and use addition and subtraction facts to add and subtract within 20. In the future unit pupils will explore the counting sequence for counting to 100 and beyond and represent the numbers from 20-99 in different ways, including marking the position on a number line. 

In prior learning, pupils will have looked for patterns and relationships in number, spotting connections and talking about what they notice. In this unit pupils will explain 11 to 19 as cardinal and ordinal numbers. They will double and halve the numbers 6 to 9 and use known facts to add and subtract within 20.

Composition of numbers 11 to 19

What number is the midpoint on this number line?

What number is the arrow pointing to on this number line?

Estimate the number shown by the arrow on this number line.

What number comes next in the count? 6, 7, 8, 9, 10, {{ }}

What number is missing in this sequence? 10, 11, 12, {{ }}, 14

Which number is in the middle of this number line?

Look at the number line. If 10 is the whole and 6 is a part, what is the missing part?

Which place value chart represents the apples?

This lesson will soon be taken down.

Explain that the digits in the numbers 11 to 19 express position on a number line

Lesson outcome