Module 2 Knowing and using number facts
Select each tab to find out more or use the breadcrumb trail to go to another part of this resource.
Can I recall and use addition and subtraction facts for numbers to 20?

Example review questions

  • square − triangle = 9
    What could the missing numbers be? What else?
  • Work out 4 + 7 + 16. What number facts did you use?
  • How many ways can you use 6, 8 and 14 in a number sentence?
  • Two numbers have a difference of 7. What could they be? What else?
  • Start at 19 on the number line. Count back in 4s. What numbers do you land on? Can you write down the number sentence for each jump?
  • What are the missing numbers? 7 + 8 = Empty box, 17 + 8 = Empty box,
    27 + 8 = Empty box
  • What is 12 − 5? How does this help you to find 120 − 50,
    72 − 5?

Teaching guidance

This teaching guidance document suggests some of the key vocabulary, models, images and practical equipment that children should experience and be able to use. It also includes some teaching tips to provide a few starting points for ways of supporting children with this area of mathematics.

DOC file Can I recall and use addition and subtraction facts for numbers to 20? - teaching guidance | 82KB new window

Consolidation and practice

These resources are to support children in guided or independent work. Roll over the highlighted resources for a description.

PDF file How to use number facts ITP | 215KB new window

SWF file Number facts ITP | 37KB new window

PDF file How to use number line ITP | 182KB new window

SWF file Number line ITP | 47KB new window

XLS file Addition and subtraction facts | 62KB new window

XLS file Which number where? | 321KB new window

PDF file Models and images for addition and subtraction facts to 20 | 164KB new window

DOC file Facts to 20 pupil record sheet | 72KB new window

Number facts

itp_number_facts.png

This interactive teaching program (ITP) is an ICT-based tool to support the exploration of corresponding addition and subtraction facts. Number facts ITP allows the child or teacher to display up to 20 counters, select some to represent an addition or subtraction number sentence, and drag counters into a container to demonstrate a subtraction.

Number line

itp_number_line.png

This interactive teaching program (ITP) is an ICT-based tool to support the exploration of number. Number line ITP allows the child or teacher to display a range of numbers from minus 50 up to 500. Children can estimate a number on the number line, explore the concept of difference between two given numbers and demonstrate their calculation strategies.

PDF file Springboard 3, Unit 2 Addition and subtraction facts | 164KB new window

PDF file Springboard 4, Unit 2 Addition and subtraction facts | 186KB new window

Opportunities to use and apply

Possible contexts include:

  • word problems, including those that involve money and measures, e.g. Sam has saved £7 and earns another £5. How much more does he need to buy trainers that cost £20?
  • number patterns and sequences, e.g.
    13 − 5 = Empty box
    23 − 5 = Empty box
    33 − 5 = Empty box
    What comes next?
  • number problems and puzzles, e.g. The number in each brick is the sum of the two bricks just below it. Complete these walls. How many ways can you find to complete the second pyramid?
    Two number pyramids. The first one consisting of six bricks in three rows. Across the bottom row, the bricks contain the numbers two, three and four. On the second row the left brick contains the number five. The remaining two bricks are empty. The second one contains the same amount of bricks but only has the number 20 in the top brick. The rest of the bricks are empty.
    2_1_20_g4a.png
  • problems from the PDF file Mathematical challenges booklet | 920KB new window, e.g. problems 31, 32 and 35.

Confirming learning

Ask probing questions such as:

  • Look at this number sentence: dot + square = 19. What could the two missing numbers be? How many possible pairs are there? How do you know you have got them all?
  • What is 13 − 8? What other subtractions using numbers up to 20 give an answer of 5?
  • 15 + 4 + 5 + 3 = Empty box
    Which numbers did you add first? Why?
  • Write one of these numbers into each box to make a correct sum. 14, 7, 9, 16, 5
    Empty box = Empty box + Empty box
  • Which addition fact could you use to find the answer to
    12 − 4?