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Representing 3-digit numbers, comparing and positioning on number lines

Representing 3-digit numbers, comparing and positioning on number lines

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Why this why now

This unit develops understanding of place value by looking at 3-digit numbers. Pupils represent them in different ways and explore how counting patterns and mental calculation strategies familiar to them can be applied to larger numbers. They consider the composition and relative size of numbers, comparing, partitioning and positioning them on number lines. Pupils also develop counting patterns by counting on and back in multiples of 2, 20, 5, 50 and 25.

Prior knowledge requirements

  • Recall number facts and sequences
  • Use place value understanding
  • Apply basic operations in context

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Why this why now

This unit develops understanding of place value by looking at 3-digit numbers. Pupils represent them in different ways and explore how counting patterns and mental calculation strategies familiar to them can be applied to larger numbers. They consider the composition and relative size of numbers, comparing, partitioning and positioning them on number lines. Pupils also develop counting patterns by counting on and back in multiples of 2, 20, 5, 50 and 25.

Prior knowledge requirements

  • Recall number facts and sequences
  • Use place value understanding
  • Apply basic operations in context

Representing 3-digit numbers, comparing and positioning on number lines

In this unit pupils will use knowledge of place value to represent a 3-digit number in different ways. They will compare and order 3-digit numbers and position on number lines and unmarked number lines.

15 lessons in unit

  1. 1

    Represent a 3-digit number up to 1,000 in different ways

    I can represent 3-digit numbers in different ways.
  2. 2

    Count forwards and backwards within 3-digits

    I can count forwards and backwards using 3-digit numbers.
  3. 3

    Position 3-digit numbers on number lines

    I can position 3-digit numbers on number lines.
  4. 4

    Estimate the position of 3-digit numbers on unmarked number lines

    I can estimate the position of 3-digit numbers on an unmarked number line.
  5. 5

    Comparing and ordering numbers with 1, 2 and 3 digits

    I can compare and order numbers with up to 3-digits.
  6. 6

    Ordering sets of 3-digit numbers

    I can order a set of 3-digit numbers.
  7. 7

    Use known facts to add and subtract multiples of 100 within 1000

    I can add and subtract multiples of 100
  8. 8

    Write a 3-digit multiple of 10 as a multiplication equation

    I can write a 3-digit multiple of 10 as a multiplication equation.
  9. 9

    Partition 3-digit numbers in different ways

    I can partition 3-digit numbers into 2 and 3 parts.
  10. 10

    Use known facts to solve problems involving partitioning numbers

    I can use known facts to help me solve partitioning problems.
  11. 11

    Use known facts to add and subtract to and from multiples of 100

    I can add to and subtract from multiples of 100.
  12. 12

    Add and subtract to and from a 3-digit number bridging 100

    I can add and subtract to and from a 3-digit number bridging 100.
  13. 13

    Solve problems by adding and subtracting to or from 3-digit numbers

    I can solve problems by adding to and subtracting from 3-digit numbers.
  14. 14

    Count forwards and backwards in multiples of 2, 20, 5, 50 and 25

    I can count forwards and backwards in 2s, 20s, 5s, 50s and 25s.
  15. 15

    Solve problems by counting forwards and backwards in multiples of 2, 20, 5, 50 and 25

    I can solve problems by counting in multiples of 2, 20, 5, 50 and 25.

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A step-by-step guide to getting started

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