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The Wonder Number Lessons

Lesson No. 12:  Division, No Remainder

Division with no remainder separates groups into equal parts.  The Wonder Number Board provides visual and manipulative evidence through the color-coding of factors in each individual block.

The first problem is 20 ÷ 5.  Place a viewer on 20 and then place a green chip on all the multiples of 5 from 5 to 20.  Count the number of chips on the board, and you will find there are 4 multiples of 5 in the number 20 (see fig 63).  Remove the last chip from the number 20 and look at the factor pairs listed inside the block (see fig 64).  One pair features a green 5 with a 4 below it, illustrating 5 x 4 = 20.  Division is the inverse operation of multiplication so 20 ÷ 5 = 4. 

The second problem is 28 ÷ 4.  Place a viewer on 28 and then place a yellow chip on all the multiples of 4 from 4 to 28.  Count the number of chips on the board and you will find there are 7 multiples of 4 in the number 28 (see fig 65).

Remove the last chip from the number 28 and look at the factor pairs listed inside the block (see fig 66).  One pair features a yellow 4 with a 7 below it, illustrating 4 x 7 = 28.  Division is the inverse operation of multiplication so 28 ÷ 4 = 7.