Short Blocks

# Maths Year 4 Autumn Addition and Subtraction (A)

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

## Partitioning and column addition(suggested as 3 days)

### Planning and Activities

Day 1 Teaching
Show a grid (see resources) and model adding two numbers using partitioning into 10s and 1s. Write 137 + 19, 178 + 31, 125 + 26, 154 + 27 and 22 + 195 on the board. Discuss how to do each one, using partitioning for all except the first, where adding 20 then subtracting 1 is best.
Group Activities
Use the ‘Make 100’ in-depth problem-solving investigation below as today’s group activity.
Or, use these activities:
-- Create and add 3-digit and 2-digit numbers, investigating finding totals with different criteria.

Day 2 Teaching
Display 324 + 439. Children work in pairs and use the written method to find the answer on their whiteboards. Note/share different strategies. Explain that today we focus on compact written addition. Model this, emphasising leaving a space above the answer for writing extra numbers (‘carry’ digits).
Group Activities

Day 3 Teaching
Display 592 + 235. Children use compact written addition on their whiteboards. Clarify any mistakes. Children then use this strategy to add three 3-digit numbers. Display:

 1 2 3 4 7 4 + 3 3 2

Children calculate the total.

Group Activities
-- Use compact written addition to add three 3-digit numbers with ‘carries’ in different columns.

### You Will Need

• ‘2-digit + 2-digit grid with missing totals’ (see resources)
• 1–9 dice or 1–9 digit cards
• ‘Adding 3-digit and 2-digit numbers’ (see resources)
• ‘Special magic squares’ (see resources)
• Calculators
• 0–9 digit cards
• Place value cards

### Mental/Oral Maths Starters

Day 1
Count on in 10s from any 3-digit number (pre-requisite skills)

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

Day 3
Add three 1-digit numbers (pre-requisite skills)

### Worksheets

Day 1
Find missing numbers in a 2-digit + 2-digit addition grid.

Day 2

Day 3
Solve word problems with adding three 3-digit numbers.

### Mastery: Reasoning and Problem-Solving

78 + 127 = ? and 348 + 39 = ?
Use a different method for each one and explain both your strategies.
• Write the missing numbers in this calculation
 200 ☐ 7 + 500 60 ☐ ☐ 40 5
• If 378 is subtracted from a number to leave 284, what was the number?