Math: algebra

5-2

Prepare in advance 10 green cubes and a favorite toy animal of your baby.
Put 5 in one group in front of the baby. Put another 5 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. Show 5 fingers and say: five! There are five cubes. Here comes (toy) and takes away 2. Count 2 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. Show 3 fingers and say: there are 3 cubes left with the baby. Let’s make an equation. Take out 5 cubes you were hiding. Put them on the left. Count them by pointing to each cube: 1,2,3,4,5. Show 5 fingers and say We had 5 cubes. Here came a (toy) and took away 2 cubes. Put the “-“sign after 5 cubes & put another 2 cubes after then “-“ sign and show 2 fingers. Put the sign “=” and say: there are 3 cubes left with the baby. Put another 3 cubes, count them and show 3 fingers. Say: 5-2=3. Point to 5 cubes and say: they are called minuend. Point to the two cubes and say they are called subtrahend. Point to the 3 cubes and say: they are called difference.

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