# Subtraction: count back/take away

Maths Year 1
This unit is part of Year 1 Flexible Maths Blocks Addition and Subtraction and Year 1 Maths Planning Addition and Subtraction (A)

### Planning and Activities

Day 1 Teaching
Draw faces on a bus on a w/b. Model how we subtract by counting back when 1 or 2 get off the bus. There are 7 on the bus and 2 get off. 7, 6, 5. We count back 2. Record 7 – 2 = 5. Repeat.
Group activities
-- Work out how many dogs are left in the rescue centre and how many people are left on the bus.

Day 2 Teaching
Show 5 red & 5 yellow pegs on a hanger. How many pegs? Children put up 10 fingers. Remove 1 peg. Children fold 1 finger. How many are left? What number sentence can we write? Repeat.
Group activities
Use the 'Spot the Difference' in-depth problem-solving investigation below as today’s group activity.
Or use these activities:
-- Make a tower of cubes and take away the number on the dice. Record the number sentence.

Day 3 Teaching
Show 5 beads on a 20-bead bar. Count on 2, saying 6, 7 as you slide beads. Children mimic on fingers. Record 5 + 2 = 7. How many if we take 2 beads away? Put the 2 beads back. Children fold 2 fingers. We are back where we started!
Group activities
-- Work out how much money is left when a child spends some and then earns some back.
-- Explore the relationship between adding and subtracting.

Day 4 Teaching
Count 5 cubes into a tin and ask how many. Drop another cube in. And now? Repeat. And now? Record addition. Take out 2 cubes, 1 by 1. How many now? Record subtraction. Repeat.
Group activities
Use the 'Spot the Difference' in-depth problem-solving investigation below as today’s group activity.
Or use these activities:
-- Game with towers of cubes. Taking away and adding numbers to see who can reach 10 or 0 cubes the first!

Day 5 Teaching
Show a word problem about dogs in a rescue centre. Model how to solve this using fingers or cubes. Write a matching calculation and repeat with other stories.
Group activities
-- Practical number stories using equipment to work them out and creating leaf posters to show the number sentences.

### You Will Need

• Picture of a bus drawn on large paper
• Pictures of dogs (see resources).
• Pictures of buses - differentiated (see resources).
• Dice labelled with digits 1, 2.
• 5 red pegs and 5 yellow pegs.
• Coat hanger.
• Number cards 1-5, 5-10 & 5-15.
• Dice labelled with digits 2, 3.
• 10 £1 coins.
• Cubes.
• Hat/tin
• Large dice labelled +1, +2, +2, –1, –2 and –2.
• Multilink & other counting resources.

### Mental/Oral Maths Starters

Day 1
Count back (pre-requisite skills)

Suggested for Day 2
Counting (simmering skills)

Day 3
Count back 2 (pre-requisite skills)

Suggested for Day 4
Bonds to 5 (simmering skills)

Suggested for Day 5
Numbers to 20 (simmering skills)

### Worksheets

Day 1
How many frogs on the lily pads when some hop into the pond?
Work out the number of passengers on a bus.

Day 2
Challenge to work out how tall the tower is after cubes have fallen off.

Day 3

Day 4
Add or subtract the number of petals to find the total.

Day 5
Work out dog rescue story problems.

### Mastery: Reasoning and Problem-Solving

• Set up using small world play equipment.
There are 7 ducks in the pond. If 2 get out, how many are left?
Write a matching number sentence.
If 3 more get in, how many ducks are on the pond?
Write a matching number sentence.
If 2 get out, how many are left on the pond?
Write a matching number sentence.
• Draw a number track from 1 to 10. Place your counter on a number. Write it. Now hop along 2. Where do you end up? Write the addition. Repeat.
 1 2 3 4 5 6 7 8 9 10
• More challenging
Write the missing numbers:
7 – 3 = ☐
5 + ☐ = 6
☐ + 2 = 5

In-depth Investigation: Spot the Difference
Children find dominoes where one side has one more spot than the other, and then where one side has two more spots than the other.

### Extra Support

What's Before Beryl?
Saying the number before any number up to 6, then 10

Dig for Acorns
Subtracting 1 from any number from 2 to 6, and then from 2 to 10, by saying the number which comes before