### Planning and Activities

**Day 1 Teaching**

Say you have 52p and spend 47p. Mark 52p on a 0–£1 penny line. Explain: We can count up to find a difference. Mark on 47p, and cross out pennies up to 50p, then to 52p: 3p + 2p is 5p left. Repeat for £63 – £56, hopping £4 to £60, then another £3 to find the £7 difference.**Group Activities**

-- Discover how much money is left by calculating differences using a penny line.**Day 2 Teaching**

Show a toy frog and agree a name. Explain that maths Frog helps us subtract by hopping up the number line to find a difference. Model how Frog hops from 37 to 45 on the bead bar to solve 45 – 37. Repeat several times with other problems on beaded lines.

**Group Activities**

-- Calculate the difference between two 2-digit numbers by counting up with Math Frog.

-- Play ‘snatch the match’: subtract two 2-digit numbers by counting up with Maths Frog.

**Day 3 Teaching**

Write 53 - 47 on the board and read it as 53 subtract 47. Model counting back; then use Frog to find the difference. Compare the two strategies. Use Frog to solve 54 – 48, 23 – 17 and 65 – 54.**Group Activities**

-- Solve subtractions using beaded, landmarked or empty number lines.

-- Suggest the subtraction by watching Maths Frog complete jumps on a bead bar.

**Day 4 Teaching**

Show how solve 62p – 47p using a 0–£1 penny line. Cross out up to 47p. Then demonstrate drawing 3 hops: 47 to 50, then 50 to 60 and 60 to 62. Write 85 – 68 and show how Maths Frog can help us count up. Repeat with 61 – 47 on a landmarked line.

**Group Activities**

Use the ‘Frog’s Busy Day’ in-depth problem-solving investigation below as today’s group activity.

Or, use this activity:

-- Solve subtractions of 2-digit numbers with answers greater than 10.

**Day 5 Teaching**

Discuss how we may want to solve 53p – 11p and 60p – 47p in different ways. The first can easily be done by counting back. The second may be more easily solved with maths frog. Repeat to choose a different strategy for 62 – 25 and 67 – 25.

**Group Activities**

-- Investigate an efficient method for subtracting (counting up or back).