# Maths Year 1/2 Autumn Addition and Subtraction

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

## Partition numbers; learn number bonds(suggested as 5 days)

### Planning and Activities

Day 1 Teaching
Use five pegs on a hanger and a cloth to model different additions to partition 5.
Further Teaching with Y2
Use a number balance to model ‘balancing sums’ to 7, 8 and 9, e.g. 5 +  = 6 + 1
Group Activities: T with Y2
Y1 -- Make ‘snakes’ using five cubes in two colours. Record the additions.
Y2 -- Use number balances to create ‘balancing sums’.

Day 2 Teaching
Use six pegs on a hanger and a cloth to model different additions and subtractions. Use a 20-bead frame to show linked pairs to 10 and 20, e.g. 5 +  = 10 and 15 +  = 20.
Group Activities: T with Y1
Use the ‘Domino loop’ in-depth problem-solving investigation below as today’s group activity.
Or, use these activities:
Y1 -- Solve a missing eggs problem … or … Make pairs to 6 using egg boxes and modelling clay eggs.
Y2 -- Explore pairs of numbers that add to 20.

Day 3 Teaching
Use a stick of cubes and bar models to show pairs to 10 and 20.
Further Teaching with Y1
Break sticks of 10 in different places; write matching additions.
Group Activities: T with Y1
Y1 -- Explore pairs to 10, making ‘snakes’ of cubes in two colours or by matching sticks of 10 cubes to bar models.
Y2 -- List all possible additions and subtractions for 10 or 20 to go with a number story.

Day 4 Teaching
Use fingers to find pairs to 10 and record additions.
Further Teaching with Y2
Use a 20-bead frame to explore complements to 20, first adding to the next 10.
Group Activities: T with Y2
Y1 -- Explore complements to 10 using sticks of cubes and number cards, or by playing number bond snap.
Y2 -- Take a card and say what needs to be added to make 20; record the matching addition and subtraction.

Day 5 Teaching
Partition 10 pegs in two colours on a hanger and record the related additions. Hide some pegs and record missing number sentences. Children say how many are hidden.
Further Teaching with Y2
Write number sentences with symbols standing for mystery numbers. Children work out what numbers they represent.
Group Activities: T with Y2
Y1 -- Place 10 spots on ladybirds in different ways. Explore all possibilities.
Y2 -- Use number facts to work out how many cubes are hidden under a cup or in a number sentence under sticky notes.

### You Will Need

• Pegs in a variety of colours (plus 6 in same colour)
• Coat hanger and cloth
• Number balance and number weights
• Coloured interlocking cubes
• Eggs made of modelling clay or real hardboiled eggs, Baskets, Egg box
• Long coloured strips of paper
• Sticky notes (two different colours)
• Modelling clay and counters
• 20-bead strings, Sand timer (e.g. 5 minute)
• ‘Slidy box' cards
• ‘Pairs to 10: cubes’ (see resources) or interconnecting cubes in the same colours
• Additional activity sheets (see resources)
• A3 paper
• Flipchart
• 0–20 number cards
• Strips of paper and plastic cups

### Short Mental Workouts

Day 1
Count on and back to 20

Day 2
Count on to 100

Day 3
Numbers to 100

Day 4
Count in tens

Day 5
Number facts up to 10

### Worksheets

Day 1
Y1: Partition five biscuits onto two plates in different ways.
Y2: Fill in missing sums with totals of 7, 8 and 9. Draw weights to create balancing sums.

Day 2
Y1: Colour eggs in boxes and write the matching addition and subtraction bond to 6.
Y2: Partition 10. Find the missing numbers for the totals of 10 and 20.

Day 3
Y1: How many are needed to make 10?
Y2: Complete bar models for pairs to 10 and 20.

Day 4
Y1: Make pairs of balloons that add up to 10.
Y2: Draw bar models for pairs to 20.

Day 5
Y1: Use pairs to work out how many pegs are hidden, or cross out pegs to compete subtraction facts.
Y2: Use number facts to work out mystery numbers.

### Mastery: Reasoning and Problem-Solving

Y1

• Write the number of blank bricks in these diagrams.
Diagram1:
 6 // // // //

Diagram 2:

 7 // // // //

Diagram 3:

 5 // //

• The crocodile has 6 fish. He eats 4. How many are left?
• The mouse has 5 bits of cheese. She finds 2 more. How many has she now?
• Write all the different ways of making 7, e.g. 1 and 6. Make sure you have them all!
• Fill in the missing numbers.
5 + ☐ = 10
7 + ☐ = 10
2 + ☐ = 10

Y2

• Write the pairs of possible missing numbers:
 20 11 ? ?
• How many different ways are there of writing numbers in the two boxes in this sentence?
☐ + ◯ = 10
What if the two boxes = 9? Or = 8?
• You have 21 cards: numbers 0 to 20. You can create how many pairs of numbers making 20? Write these. Write the pair you cannot create.

In-depth Investigation: Domino Loop
Children make loops of dominoes such that meeting ends have a given total number of spots.

Y1
Give Me Five