Short Blocks

# Maths Year 1/2 Summer Place Value and Addition

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

## Place Value in 2-digit numbers(suggested as 3 days)

### Planning and Activities

Day 1
Use Spider and Fly on the 100-square to show how to add 10, 1, 11 and 12 to 36. Repeat, starting with 25, 71 and 68.
Group Activities: T with Y1
Y1 -- Fill in a table to show which digits change when we add 1, 10 and 11.

Day 2
Use Spider and Fly on the 100-square to show how to subtract 10, 1 and 11 from 56. Repeat, starting with 48, 72 and 51.
Further Teaching with Y2
Ask children to use the digits 3, 5 and 7 to make as many 2-digit numbers as they can and write them in ascending order. Observe how this enables finding all possibilities.
Group Activities: T with Y2
Use the ‘New Neighbours’ in-depth problem-solving investigation below as today’s group activity.
Or, use these activities:
Y1 -- Fill in a table to show which digits change when we subtract 1, 10 and 11.
Y2 -- Mobile phone keypad investigation. How many 2-digit numbers can be made? Reason about systems for recording/ organising results.

Day 3
Show two 1-digit cards. Y1: write the smallest possible number, Y2: write both possible numbers and a number in between. Explain the Y1 investigation.
Further Teaching with Y2
Join two 100-bead strings together to form a 200-bead string. Show numbers between 100 and 200, recognising similarities with numbers between 0 and 100.
Group Activities: T with Y2
Y1 -- Investigate subtracting numbers with reversed digits trying to find as big an answer as possible.
Y2 -- Reason about the position of numbers on a 101–200 square. Play a game to identify missing numbers on a 101–200 square.

### You Will Need

• ‘100-square’ (see resources)
• Plastic Spider and Fly
• Whiteboards and pens
• ‘Spider and Fly sums’ (see resources)
• Counters
• Flipchart and pens
• Coloured pencils
• Large 3, 5 and 7 digit cards
• ‘Spider and Fly subtractions’ (see resources)
• ‘Mobile phone keypad’ (see resources)
• Large number cards 1–9
• IWB calculator
• Calculators
• ‘Empty 101–200 square’ (see resources)
• ‘Partially complete 101–200 square’ (see resources)
• Cubes

### Short Mental Workouts

Day 1
Spider counting

Day 2
Count in tens from 1-digit numbers

Day 3
Place value in 2-digit numbers

### Worksheets

Day 1
Y1: Fill in a table to show which digits change when we add 1, 10 and 11.

Day 2
Y1: Fill in a table to show which digits change when we subtract 1, 10 and 11.
Y2: Investigate possible 2-digit numbers that can be made using digits 2, 4, 6 and 8.

Day 3
Y1: Compare and order pairs and trios of 2-digit numbers.
Y2: Identify and mark numbers on a 100–200 beaded line.
Identify and mark numbers on a 100–200 landmarked line.

### Mastery: Reasoning and Problem-Solving

Y1

How long can you continue this?
• Subtract 11 from 87.
Then take 11 from the answer.
Subtract 11 again.
How long can you continue this?
• Complete the triangle (see download) by writing the missing number. The three corner numbers add up to the one in the middle!

Y2

• Add 12 to these numbers:
18, 42, 55, 79, 29, 50
• Paulo added 12 repeatedly to a 1-digit number, finishing on 157. What 1-digit number did he start on?
• Callie says the missing number is 49
62 = 12 + ☐
Do you agree?
• Start at 7 and count on in tens. What is the largest number <200 you will say?

In-depth investigation: New Neighbours
Children use digit cards to make 2-digit numbers between neighbouring multiples of 10.