### Planning and Activities

**Day 1**Use a bead bar 1-100 and demonstrate how many beads we need to add to 8 to make 10, then show 8 + 4, 8 + 5, 18 + 5, 28 + 5…, explicitly explaining

**bridging**the tens.

**Further Teaching with Y2**

Remind children how to draw number line jottings for Frog to solve ‘counting up’ subtractions such as 43 – 38.

**Group Activities: T with Y2**

Y1 -- Use patterns to add 1-digit numbers to 2-digit numbers. Find additions of the type ☐☐ + ☐ which give answers ending in 1, then 3.

Y2 -- Use Frog to answer given subtractions then create subtractions which all have the same answer.

**Day 2**Y2 help you use Frog to find 24 – 17 then 73 – 65; ask Y1 children to help with certain steps. Recognise similarities with bridging that they have been doing, but be explicit about the two different types of calculation (counting on by bridging 10 to solve an

**addition**/ counting up to find a difference to solve a

**subtraction**).

**Further Teaching with Y1**

Show children a 100-square and Fly. Model adding 5 to 17, using Fly to go to 20 first, and then counting on 2 more. Record: 17 + 5 = 22.

*Do you see how we bridged 20, a tens number?*Repeat for 28 + 6 and 36 + 5.

**Group Activities: T with Y1**

*Use the ‘The animals have a busy day’ in-depth problem-solving investigation below as today’s group activity.*

Or, use these activities:

Y1 -- Calculate additions, bridging a tens number using Fly.

Y2 -- Use Frog to subtract numbers with reversed consecutive digits (e.g. 65 – 56); describe results.

**Day 3**Roll a dice repeatedly to add numbers 1–6 to a running total on the 0–100 beaded line, bridging as necessary past each tens number.

**Further Teaching with Y2**

Use Frog to calculate 53 – 38 and 82 – 65, i.e. subtractions with answers between 10 and 20.

**Group Activities: T with Y2**

Y1 – Play a game adding 1-digit numbers aiming to get close to 40 without ‘going over’.

Y2 -- Spot the odd one out! Use Frog to find out which subtraction is the odd one out (gaps between 10 and 20).