Math: algebra


Prepare in advance 30 green cubes. Make 2 groups of green cubes. One group should consist of 8 green cubes. Another group should consist of 7 green cubes. The cubes in the groups should be scattered in a random order, not put in a straight line or row. The two groups should be located away from each other to make them distinctive groups but not too far from each other so that the baby can see two groups in one location. Another 15 cubes should be behind you so that the baby does not see them. Smile and say: Look Baby! I see two distinctive groups of cubes! Point to the first and then the second group. Say I wonder how many cubes we have all together? Place your hand over the two groups, make a round in the air above them showing togetherness. Let’s make predictions! I think we have 10! Show ten fingers. Now we can check it out. Place your hand over the first group. Say: This is called summand. Let’s count the cubes in the first group. 1,2,3,4,5,6,7,8. Say: There are eight cubes in this group (show eight fingers). Place your hand over the second group. Say; This is called summand too. Now let’s count the cubes in the second group: 1,2,3,4,5,6,7. Say: There are seven cubes in this group (show 7 fingers). Say: let’s sum them up (put your 2 hands together as if you were clapping). We will make an equation by putting two signs: “+” and “=”. See how! Make an equation by putting the “+” sign in between the groups. The “+” sign can be made of sticks or cut vegetables. Put the “=” sign after the second group. Say: we are going to count all the cubes before the sign “=”. Start counting by pointing first to the first group, then switch to the second (from left to right): 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15. There are 15 (show 15 fingers, first 10 and then 5) cubes all together! Take out another 15 cubes you were hiding and put them randomly after the “=” sign. Count them: 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15! (Show 15 fingers) Point to the group after the sign “=”. Say: This is called the sum!
Say: 8 (show 8 fingers) + 7 (show 7 fingers) equals 15 (show 15 fingers)!

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