Short Blocks

Maths Year 1/2 Spring Addition & Subtraction (A)

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

Mental addition and subtraction (suggested as 5 days)

Planning and Activities

Day 1
Write the number sentence 3 + ☐ = 8. Children discuss. Hold up a strip of 8 cubes and beneath it a strip of 3 cubes. How many more cubes to make 8? Fill in the number sentence 3 + 5 = 8. Repeat for other bonds to 8.
Further Teaching with Y2
Use the bead frame to show linked additions and subtractions, e.g. 5 + 2, 15 + 2, 5 -2, 15 – 2.
Group Activities: T with Y2
Y1 -- Game to find the matching number to make 8. Order number bonds to 8; find matching number bonds partners.
Y2 -- Solve additions using number facts, focusing on place value of 10s digit. Solve additions and subtractions using number facts given on cards.

Day 2
Write 35 + 3, 27 – 5, 30 + 5, 46 + 6, 27 – 7, 56 + 3, and 99 – 3 on cards. Y1 What is 5 + 3? Y2 Can you see an addition where you could use this fact? Stick this card under a heading Number fact. Y2s How would you work out 27 – 5? 30 + 5? Stick the card under a heading Place value.
Further Teaching with Y1
Write 9 + 0, 3 + 6, 7 + 2, 4 + 5, 8 + 1. Show that we can write addition either way round. 3 + 6 = 9 and 6 + 3 = 9. Use these bonds to write subtraction facts, e.g. 9 – 4 = 5.
Group Activities: T with Y1 or Y2
Y1 -- Make number bonds to 9 with cubes in a feely bag.
Play a game creating number bond sentences with a partner.
Y2 -- Sort calculations according to the strategy used to solve them. Investigate equality using an on-screen interactivity.

Day 3
Children write the number facts to 8 on their whiteboards. Use pegs and a coat hanger to help children write related subtraction facts.
Further Teaching with Y2
Show a bead bar and demonstrate adding 8 and 5 by doing 8 + 2 + 3 (‘bridging’). Show on beaded and landmarked lines.
Group Activities: T with Y2
Y1 -- Make snakes of 8 and 9 cubes in 2 colours and record as a subtraction.
Y2 -- Develop understanding of bridging 10 when adding a 1-digit number to a 2-digit number using beaded lines or landmarked lines.

Day 4
Use dotty dice (i.e. with dots not numerals), asking children to add 3 numbers, 2 of which total 10. Discourage counting on in 1s. Encourage looking for known pairs that make 10, then add the remaining number.
Further Teaching with Y2
Use 1-100 grid and the beaded line to subtract 1-digit numbers from 2-digit numbers, bridging through multiples of 10.
Group Activities: T with Y2
Y1 -- Play a game of skittles, adding 3 numbers to find the total.
Y2 -- Children sort and solve subtractions by bridging 10, using 1-100 number grids, beaded or landmarked lines.

Day 5
Shuffle 2 packs of 0–9 digit cards, and take these 3 cards: 4, 3 and 4. Choose a strategy to add these (double 4 first, then count on 3). Repeat for other sets of 3 cards, then 5 cards encouraging different strategies such as starting with the largest number.
Group Activities: T with Y1
Use the ‘Cross sums’ in-depth problem-solving investigation below as today’s group activity.
Or, use these activities:
Y1 -- Choose an efficient order to add three 1-digit numbers.
Y2 -- Choose an efficient order to add at least three 1-digit numbers

You Will Need

  • Multilink cubes
  • ‘How many more to make 8’ cube bar model (see resources)
  • Sticky notes
  • 20 bead frame (2 rows of 10)
  • Number cards
  • Number fact cards (see resources)
  • 1 to 100 number grid (see resources)
  • Place value cards
  • Feely bag, Counters
  • ‘Sorting calculations’ sheets (see resources)
  • Number shapes, e.g. Numicon
  • 5 pegs in one colour and 5 in another, coat hanger, cloth
  • Large 0 to 100 beaded line
  • 0 to 100 landmarked line (see resources)
  • ‘Target the 10s’ calculation cards (see resources)
  • 0 to 100 beaded lines (see resources)
  • Target the 10s recording sheet (see resources)
  • Landmarked lines (see resources)
  • 100-bead bar
  • Pre-prepared skittles, ball
  • 0 to 20 and 0 to 30 beaded lines (see resources)
  • ‘Make your own subtractions’ sheet (see resources)
  • 1 to 100 grid with multiples of 10 in red (see resources)
  • 1-6 dotty dice, 1-10 or 0-9 dice

Short Mental Workouts

Day 1
Pairs to 6

Day 2
Pairs to 7

Day 3
Pairs to 10

Day 4
Pairs to 10

Day 5
Doubles

Worksheets

Day 1
Y1: Draw missing cubes to complete number bonds to 8.
Y2: Children show how to solve addition and subtraction problems using number facts.

Day 2
Y1: Calculate how many more candles each cake would need to have 9 candles in total.
Y2: Solve addition and subtraction calculations to play a game of 4-in-a-row.

Day 3
Y1: Relate adding and subtracting: use addition facts to create subtraction number sentences.
Y2: Train Journey: adding single digit numbers to keep a running total of the number of passengers on a train.

Day 4
Y1: Add 3 numbers, spotting pairs to 10, using beaded lines for support.
Add 3 numbers, reordering to add efficiently.
Y2: Match subtraction calculations to correct answers by counting back or using number facts.

Day 5
Y1: Add numbers on 3 dice, to add efficiently.
Y2: Look for known number facts to help efficiently add a series of single-digit numbers.

Mastery: Reasoning and Problem-Solving

Y1

  • Point at the first number and count on.
    5 + ☐ = 9, 6 + ☐ = 8
    ☐ + 6 = 9, 3 + ☐ = 8
    ☐ + 2 = 9, 1 + ☐ = 8
  • 9 frogs in the pond. 3 hop out. How many now?
  • 8 beetles on a leaf. 5 fly away. How many now?
  • Choose 3 numbers:
    [7] [3] [5] [4] [7] [6]
    • Choose an efficient strategy to add them. Write the answer.
    • Tell me why you added them in that order.
    • Choose three more and do it again…

Y2

  • Fact families. Write 4 number sentences that link each ‘trio’ of numbers:
    3, 8, 5
    27, 2, 25
  • Fill in the missing numbers:
    62 + ☐ = 69, 48 = 43 + ☐
    37 + ☐ = 41, ☐ – 5 = 74
  • Solve each addition using a different method. Say how you did each one.
    30 + 9 = 17 + 5 = ☐
    4 + 7 + 6 = ☐
  • Solve each subtraction using a different method. Say how you did each one.
    25 – 5 = ☐
    14 – 6 = ☐
    58 – 4 = ☐

In-depth investigation: Cross sums

Y1: Children arrange numbers 1 to 5 on a cross and show that the row and column have the same total.

Y2: Children find totals of 5 numbers less than 10 to give different totals.

Extra Support

Y1:
Deadly Dinosaurs
Finding pairs which make 6

Shape Sums
Finding pairs which make 10

Y2:
Sums say the answers!

Using place value to add, e.g. 20 + 4 = 24

What's the gap?
Saying the next 10s number; Finding how many to the next 10s number, e.g. 36 + ? = 40

Spot the 10
Adding three 1-digit numbers, spotting a pair with a total of 10