蜜芽传媒

This clip shows how to easily subtract tens and near tens. Forty four apples are picked and loaded into a pram so that they can be sold. Ten are removed because they are bruised, and a further 11 are removed because they are maggoty. Bill subtracts 10 from 44. He then takes us through the strategy for subtracting 11 by taking away 10 and then 1. After this, 9 more apples fall out of the pram. Bill works out how many he has left by subtracting 10 and adding 1 back. Bernie eat some of the apples, so Bill also needs to subtract 1 from various numbers.