Short Blocks

Maths Year 3 Spring Addition & Subtraction (B)

Each unit has everything you need to teach a set of related skills and concepts.

Use different strategies to subtract (suggested as 3 days)

Planning and Activities

Although column subtraction is specified for Year 3 in the National Curriculum, Hamilton believe that teaching column subtraction in Year 4 will be more successful. The National Curriculum Guidance specifies that teachers can teach areas of study in different year groups than those mentioned in the Curriculum, so long as they are taught within the same Key Stage. If you would like to teach column subtraction in Year 3 please see Year 4 Addition and Subtraction autumn Unit 7, spring Unit 4 and summer Units 2 and 3.

Day 1 Teaching
Show items for sale (see resources). Children remove 10p from each price and show you on whiteboard. Then start again and remove 9p from each price. Practise reducing by other amounts, e.g. 12p, 21p, etc. Use Spider on the 1-100 grid to demonstrate.
Group Activities
-- Reduce prices by near multiples of 10p.

Day 2
Use Maths Frog. He helps us to subtract by counting up to find a difference. He ALWAYS hops to the next 10 and then to 100. He starts with the smaller number. Write notes. Use Frog for 45 – 32, 78 – 44, 54 – 23. Model: Below the line record the numbers where Frog lands and above the line the size of each hop.
Group Activities
Use the ‘Magic square differences’ in-depth problem-solving investigation below as today’s group activity.
Or, use these activities:
-- Choose numbers between given multiples of 10, use Frog to subtract the smaller from the larger aiming to find the smallest and biggest answers that they can. Use landmarked lines.
-- Use Frog to work out how much dogs have grown. Draft own number line jottings.

Day 3
We’ve revised different ways of subtracting; we’ve looked at using Frog to count up and counting back to subtract near multiples. Write: Frog and Counting Back as column headings. Ask children to give an example for each. Correct misunderstandings.
Group Activities
-- Choose Frog or Counting Back to subtract.

You Will Need

  • Subtracting near multiples sheet 1 (see resources)
  • 1-100 number grid (see resources)
  • Subtracting near multiples sheet 2 (see resources) or label actual items with the tags
  • Blank-sided dice
  • Toy frog
  • Beaded and landmarked lines to display on the IWB (see resources)
  • Additional activity sheets (see resources)

Mental/Oral Maths Starters

Day 1
Add and subtract 1-digit numbers to/from 2-digit numbers (pre-requisite skills)

Day 2
Pairs to 100 (pre-requisite skills)

Suggested for Day 3
2 and 5 times tables (simmering skills)

Worksheets

Day 1
Subtract multiples of 10 and near multiples.

Day 2
Use Frog to work out subtractions on landmarked lines.

Day 3
Choose Frog or counting back to work out given subtractions.

Mastery: Reasoning and Problem-Solving

  • Frog, Counting Back (CB) and subtracting multiples of 10 or Near Multiples (NM) are 3 different ways of subtracting. Write CB, NM or Frog beside each subtraction below.
    (i) 64 – 56
    (ii) 53 – 9
    (iii) 72 – 57
    (iv) 86 – 5
    (v) 37 – 19
    (vi) 62 – 28
  • Write the missing numbers
    (a) ☐ + 30 = 55
    (b) 100 - 79 = ☐
    (c) ☐ + 19 = 65
    (d) 73 – ☐ = 58
    (e) 50 – ☐ = 43
    (f) ☐ + 47 = 62
  • Padma spends 39p on a drink. She uses a 50p coin to pay. How much change does she get?
  • Sam has 76 cards. Tom has 92. How many more does Tom have than Sam?

In-depth Investigation: Magic Square Differences
Children use the magic square to generate two-digit numbers and explore difference patterns.

Extra Support

Hop, Jump, Hop
Subtracting pairs of 2-digit numbers either side of a multiple of 10, e.g. 54 – 37, using counting up (Frog).