Math: algebra

7 red 10 green

Prepare in advance 17 cubes
Make 2 groups of red and green cubes. One group should consist of 7 red cubes. Another group should consist of 10 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. Smile and say: Baby, which group do you thing is larger and which one is smaller? Let’s make predictions! I think group 1 is larger. Now we can check it out. We will put each group in a row. Start putting red cubes in one row counting: 1, 2, 3, 4, 5, 6 and 7. Say: There are seven (show seven fingers) cubes in this group. Now we will put the other green cubes in the second row under the red ones. Start putting the green cubes, counting: 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10. Say: There are ten (show ten fingers) cubes in this group. Place your hand over the first group. Say: here are 7 (show seven fingers) cubes. Place your hand over the second group. Say: and here are 10 (show 10 fingers) cubes. The red line is shorter than the green line. The green line is longer than the red one. That means that green cubes are more than red ones.

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