# Maths KS1: Subtracting 2 from 4

Rodd finds his microphone is faulty. He repairs it by putting in 2 new batteries from a pack of 4.

Rodd challenges the children to work out how many batteries are left in the pack, without looking at it.

The children can join in counting with Rodd’s special abacus, with finger counting, pretending to be robots, checking on the number track and singing a number rap about how ‘4 take away 2 leaves 2’.

This is from the series: Counting with Rodd Counting with Rodd 2

### Teacher Notes

Students could take on the role of a robot as Rodd did in the clip.

Students could dance to music but when the music stops they could pretend that their batteries have run out.

A box of batteries could be created from rolled up paper or cardboard tubes.

Two batteries could be given to the first robot without showing them the inside of the box.

Can the students work out how many must be left in the box? Each student who works this out correctly could be rewarded with their two batteries.

This could be repeated until there are no batteries left in the box.

### Curriculum Notes

This clip is relevant for teaching Maths at KS1 in England, Foundation Phase in Wales and Early and 1st Level in Scotland. Also Foundation and KS1 in Northern Ireland.