Short Blocks

# Maths Year 1/2 Summer Subtraction and Using Money

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

## Bridging 10 and counting up subtraction(suggested as 3 days)

### Planning and Activities

Day 1
Use a bead bar 1-100 and demonstrate how many beads we need to add to 8 to make 10, then show 8 + 4, 8 + 5, 18 + 5, 28 + 5…, explicitly explaining bridging the tens.
Further Teaching with Y2
Remind children how to draw number line jottings for Frog to solve ‘counting up’ subtractions such as 43 – 38.
Group Activities: T with Y2
Y1 -- Use patterns to add 1-digit numbers to 2-digit numbers. Find additions of the type ☐☐ + ☐ which give answers ending in 1, then 3.
Y2 -- Use Frog to answer given subtractions then create subtractions which all have the same answer.

Day 2
Y2 help you use Frog to find 24 – 17 then 73 – 65; ask Y1 children to help with certain steps. Recognise similarities with bridging that they have been doing, but be explicit about the two different types of calculation (counting on by bridging 10 to solve an addition/ counting up to find a difference to solve a subtraction).
Further Teaching with Y1
Show children a 100-square and Fly. Model adding 5 to 17, using Fly to go to 20 first, and then counting on 2 more. Record: 17 + 5 = 22. Do you see how we bridged 20, a tens number? Repeat for 28 + 6 and 36 + 5.
Group Activities: T with Y1
Use the ‘The animals have a busy day’ in-depth problem-solving investigation below as today’s group activity.
Or, use these activities:
Y1 -- Calculate additions, bridging a tens number using Fly.
Y2 -- Use Frog to subtract numbers with reversed consecutive digits (e.g. 65 – 56); describe results.

Day 3
Roll a dice repeatedly to add numbers 1–6 to a running total on the 0–100 beaded line, bridging as necessary past each tens number.
Further Teaching with Y2
Use Frog to calculate 53 – 38 and 82 – 65, i.e. subtractions with answers between 10 and 20.
Group Activities: T with Y2
Y1 – Play a game adding 1-digit numbers aiming to get close to 40 without ‘going over’.
Y2 -- Spot the odd one out! Use Frog to find out which subtraction is the odd one out (gaps between 10 and 20).

### You Will Need

• ‘0–20 beaded line’ (see resources)
• Toy Frog
• Flipchart and pens
• Plastic Fly
• ‘0–100 beaded lines’ (see resources)
• ‘100-square’ (see resources)
• ‘Number sentence cards’ (see resources)
• Counters
• Whiteboards and pens
• 1–6 dice
• ‘0–100 beaded line’ (see resources)
• ‘0–50 beaded lines’ (enlarged to A3, see resources)

### Short Mental Workouts

Day 1
Pairs to 10

Day 2
What’s the next multiple of 10?

Day 3
How many to the next 10?

### Worksheets

Day 1
Y1: Bridge 10 to add a pair of 1-digit numbers.
Bridge 10 to add a 1-digit number to a 2-digit number; recognise patterns in 1s digits.
Y2: Use Frog to subtract numbers either side of a multiple of 10 on a beaded line.
Use Frog to subtract numbers either side of a multiple of 10 on an empty number line.

Day 2
Y1: Use number bonds to 10 to solve additions by bridging tens.
Y2: Interpret a bar model, then use Frog to subtract numbers either side of a multiple of 10.

Day 3
Y1: Solve additions using number bonds to bridge tens.
Y2: Use Frog to subtract by counting up (answers between 10 and 20) on a beaded line.
Use Frog to subtract by counting up (answers between 10 and 20), drawing own empty number line.

### Mastery: Reasoning and Problem-Solving

Y1

• Write the sum Fly does before doing each of these additions. The first one is done for you.
36 + 6 = ☐
Fly does 36 + 4 = 40
Then +2. 36 + 6 = 42

48 + 4 = ☐
Fly does 48 + ☐ = ☐
Then +☐. 48 + 4 = ☐

57 + 5 = ☐
Fly does 57 + ☐ = ☐
Then +☐. 57 + 5 = ☐

25 + 7 = ☐
Fly does 25 + ☐ = ☐
Then +☐. 25 + 7 = ☐

39 + 3 = ☐
Fly does 39 + ☐ = ☐
Then +☐. 39 + 3 = ☐

Y2

• Find the change from 50p if I spend 38p.
• Draw Frog’s hops on a number line to show the difference between 43 and 36.
Draw Frog’s hops on a number line to show 65 – 58.
• Tell Frog how many hops he will need to do for each of these subtractions:
a) 45 – 38
b) 62 – 45
c) 71 – 65
d) 34 – 18