Math: algebra

4*5

Prepare in advance 20 cubes.
Put 20 cubes next to you. Say today we will see how we can multiply things. Look, we have here 4 cubes (show 4 fingers). Count the cubes by pointing to them. Put the 4 cubes in a row in front of the baby. Say: I want to multiply those cubes by 5, it means I want to have 4 cubes put in 5 rows. Take another 4 cubes and put them right below the first ones. Point to the second row of cubes and count them: 1,2,3,4. Show 4 fingers. Say: there are two rows now. Let’s make 3 more. Take 12 more cubes and put them in 3 more rows all below the first two rows. Count 1,2,3,4 while putting. Say: let us count our row: 1,2,3,4,5. There are 5 rows having 4 cubes each. Now we have to count all of the cubes together. Pointing to the cubes, start counting from the upper left corner, left to right, up to down: 1,2,3,4, … 20! Twenty. (show 20 fingers, ten and then again ten). 4 multiplied by 5 equal 20! Now repeat the same with towers instead of rows.

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