Short Blocks

Maths Year 2 Spring Addition and Subtraction (B)

Each unit has everything you need to teach a set of related skills and concepts. 'Teaching for Understanding' provides whole-class teaching and fully differentiated adult-led group activities. ‘Problem-solving and Reasoning’ develops these skills, and includes questions to enable you to assess mastery. Practice sheets ensure procedural fluency. Extra support activities enable targeted work with children who are well below ARE.

‘UNIT PLAN’ gives you a text version of all parts of the unit to use in your school planning documentation. ‘DOWNLOAD ALL FILES’ gives you that unit plan plus all of associated documents. These bulk downloads are added value for Hamilton Friends and School Subscribers.

Unit 1 Find money totals: solve word problems (suggested as 3 days)

Objectives

Find money totals: solve word problems
Unit 3: ID# 2437

National Curriculum
AS (i) (ii) (iii) (v)
Meas (iii) (iv) (v)

Hamilton Objectives
27. Recognise/use symbols for pounds (£) and pence (p); combine amounts, find different combinations of coins that give the same amount.
28. Solve simple problems in a practical context; add and subtract pence and pounds, including finding and giving change.
15. Solve problems involving addition and subtraction of numbers, quantities and measures, using recall of number facts and appropriate models and images.

Teaching and Group Activities for Understanding

Day 1 Teaching
Use BBC website to play a game of ‘Igloo shopping’. Children have a pot of money and choose coins to pay for different objects. Check on screen. Move to the hard level to select and pay amounts like £4.23.
Group Activities
Use the ‘Coin Trios’ in-depth problem-solving investigation below as today’s group activity.
Or, use these activities:
-- Play an online shopping game to make given amounts, offering alternative combinations.
-- Use coins to make given amounts, offering alternative combinations.

Day 2 Teaching
Set up a shop with priced items. Children select two items and work out the total using a familiar strategy based on adding 10ps and then the 1ps to the larger starting number. Repeat. Make errors in your addition as the teacher and have children correct you, modelling the method.
Group Activities
-- Shop for two items with 2-digit prices, adding to find the total.
-- Play Cuddly Toy Sale game online, adding two 2-digit amounts.

Day 3 Teaching
Display a Word problem. Discuss the strategies that might be needed to solve it. Take suggestions. Write a number sentence to represent the problem. Children display a subtraction or addition symbol in response to your reading more word problems to show which operation they would use to solve them.
Group Activities
-- Sort and solve addition and subtraction word problems.
-- Create addition and subtraction word problems.

You Will Need

  • Pots of coins, cubes & drawing materials
  • Mini whiteboards and pens
  • Priced items ‘to sell in your shop’
  • Items to sell & blank tags
  • Paper with + and – signs
  • 1–100 square on the Interactive Whiteboard
  • ‘Word problems’ sheet (see resources)
  • Counters (or a plastic spider and fly)
  • 1–100 number grid (see resources)
  • 0–100 landmarked line (see resources)

Mental/Oral Maths Starters

Day 1
Coin recognition (pre-requisite skills)

Day 2
Ten more/ten less (pre-requisite skills)

Suggested for Day 3
Saying 1 or 2 less than a 2-digit number (simmering skills)

Procedural Fluency

Day 1
Suggest ways to make given amounts, using at least 3 coins.

Day 2
Muffin shop: combine the costs of muffins and icing to find the total cost of a cake.

Day 3
Identify the operation for a series of word problems, then solve them.

Mastery: Reasoning and Problem-Solving

  • Amit makes £1.15 in three different ways using different coins. He never uses any ‘copper’ coins.
    Suggest these three ways. One way uses 5 coins. Can you find it?
  • Choose two of these cards.
    Find and write their total.
    How many different totals can you make?
34p53p
44p25p

In-depth Investigation: Coin Trios
Children make amounts of money using three coins, speculating whether larger amounts of money can be made in more ways or not.

Extra Support

Coin Counting On
Finding the total of pairs of coins (up to 20p)

Unit 2 Add and double by partitioning (suggested as 3 days)

Objectives

Add and double by partitioning
Unit 4: ID# 2447

National Curriculum
PV (vi)
Add/Sub (i) (ii) (iii)

Hamilton Objectives
6. Use place value and number facts to solve problems, e.g. 60 –  = 20.
10. Add a 2-digit number and tens; add two 2-digit numbers that total less than 100 by counting on in tens and ones.
15. Solve problems involving addition and subtraction of numbers, using recall of number facts and appropriate models and images.

Teaching and Group Activities for Understanding

Day 1 Teaching
Launch the ITP Place value; use 2 pairs of cards to show double 23. Click to partition, then model doubling 20 and doubling 3.
Record: 23 + 23
= 20 + 20 + 3 + 3
= 40 + 6
= 46. Repeat for double 34, 42, 46. Model halving 46 in a similar way. Halve 24, 66 and 34.
Group Activities
Use the ‘Jack’s amazing beanstalk’ in-depth problem-solving investigation below as today’s group activity.
Or, use these activities:
-- Play Hit the Button online: doubling and halving game, applying partitioning.
-- Play halving and doubling ‘pairs’ game.

Day 2 Teaching
Model partitioning to add 34 + 23. Use the same method as for doubling and record in same way:
34 + 23
= 30 + 20 + 4 + 3
= 50 + 7
= 57. Repeat for 45 + 24, 36 + 22 and 46 + 25.
Group Activities
-- Play an adding two 2-digit numbers card game: collaborative calculations.
-- Add two 2-digit prices to find the total cost.
-- Play an adding two 2-digit numbers card game: first to answer challenge.

Day 3 Teaching
In pairs, children make 65 and 24 using place value cards. Mimic on ITP Place Value. Combine the 10s and 1s to find a total.
Record: 65 + 24
= 60 + 20 + 5 + 4
= 80 + 9
= 89. OR we can count up in 10s and 1s (so add 20 then 4). Show an empty/ landmarked number line jotting to work this out. Which do the children prefer? Why? Share other sums discussing strategies.
Group Activities
-- Play an adding two 2-digit numbers card game: first to answer challenge.
-- Suggest pairs of numbers that make a given total.

You Will Need

  • ITP: Place Value
  • Place value cards
  • Internet access
  • Blue and green cards
  • 10s Number cards
  • 1s Number cards
  • Whiteboards and pens
  • Beaded lines (see resources)

Mental/Oral Maths Starters

Day 1
Double multiples of 5 to 50 (pre-requisite skills)

Day 2
Add multiples of 10 (pre-requisite skills)

Suggested for Day 3
Number facts (simmering skills)

Procedural Fluency

Day 1
Calculate and match pairs of halves and doubles.

Day 2
Add 2-digit numbers using partitioning and record jottings.

Day 3
Choose and ue different strategies to add pairs of 2-digit numbers (partitioning or counting on in 10s then 1s).

Mastery: Reasoning and Problem-Solving

  • Double 13 = Δ
    Double Δ is ✦
    Double ✦ is ☐
    Find the value of Δ, ✦ and ☐
  • Fill in the missing numbers:
    65 + 24
    add the 10s: 60 + ☐ = ☐
    add the 1s: ☐ + 4 = ☐
    so 65 + 24 = ☐

    46 + 35
    ☐ + 30 = ☐
    6 + ☐ = ☐
    so 46 + 35 = ☐
  • Explain why it is probably easier to do these two additions in different ways:
    a) 65 + 21
    b) 56 + 35
    Now find both totals


In-depth Investigation: Jack's Amazing Beanstalk
Children double numbers and add to a running total, and then look for patterns to predict how much a beanstalk will grow each day.

Extra Support

Six Beads
Children practise recognising the place value of each digit in a two-digit number. Six Beads from nrich.maths.org.