Math: algebra

8-4

Prepare in advance 16 green cubes and a favorite toy animal of your baby.
Put 8 in one group in front of the baby. Put another 8 behind you so that the baby can’t see them. Say: let’s talk about subtraction. Look, we have some cubes. Let’s count them. Start counting by pointing to each cube: 1,2,3,4,5,6,7,8. Show 8 fingers and say: eight! There are eight cubes. Here comes (toy) and takes away 4. Count 4 by pointing to each of them cubes and put them away in a separate group. Say: let us see how many we still have left with the baby. Count the cubes that are left by pointing to each of them: 1,2,3,4. Show 4 fingers and say: there are 4 cubes left with the baby. Let’s make an equation. Take out 8 cubes you were hiding. Put them on the left. Count them by pointing to each cube: 1,2,3,4,5,6,7,8. Show 8 fingers and say We had 8 cubes. Here came a (toy) and took away 4 cubes. Put the “-“sign after 8 cubes & put another 4 cubes after then “-“ sign and show 4 fingers. Put the sign “=” and say: there are 4 cubes left with the baby. Put another 4 cubes, count them and show 4 fingers. Say: 8 - 4=4. Point to 8 cubes and say: they are called minuend. Point to the four cubes and say they are called subtrahend. Point to the other 4 cubes and say: they are called difference.

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