Our class puppet is working out 9 + 2. Watch what the puppet does: it starts all the way back at 1 and counts 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11.
Was there a quicker way? What would you tell the puppet to do so it does not have to count so far?
The number line shows each sum as little jumps forward. Watch where the marker starts and count the jumps with me. Two of these you'll predict before we reveal them.
We will work through four sums together, one at a time on the number line, and I will call a different pupil up to the board for each one. While one pupil plots, everyone else follows along and counts each little jump aloud together.
First up is 8 + 1 — which number do we stand on, and how many jumps? When that one is done, we will look at 6 + 2, then 10 + 0, and last of all 15 + 2. Watch closely when we reach 10 + 0 — that one is the surprise!
In your maths copy, write 9 + 2 = 11. Say it aloud as you write: nine plus two equals eleven. Form the + sign and the = sign carefully.
We plot these on the board one at a time, and a different pupil comes up for each while the class counts every little jump aloud together: 8 + 1, then 11 + 2, then 15 + 0, then 17 + 2. Start on the bigger number, count your little jumps, and use the Check button to see the tick. The 15 + 0 one will try to trick you — remember what adding zero does!
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