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.
Y2 -- Add 12 repeatedly and reason about the patterns made.

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
  • Two 100-bead strings
  • 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.
Y2: Add 12, reason about starting numbers.

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

  • Add 11 to 32.
    Then add 11 to the answer.
    Then add 11 to the answer.
    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.

Extra Support

Y1: Spider Adds
Add 10 to 2-digit numbers.

Y2: Use one of the Y1 Day 2 group activities.