Arithmetic Grade Four

Lesson Forty-four: Multiples of Ten

These problems are a little more difficult: 

  30 x 6 = 180		4 x 20 = 80		2 x 400 = 800

  600 x 4 = 1200	2000 x 2 = 4000		5 x 30 = 150
Let's look at some more examples in more detail 

  ORIGINAL PROBLEM	REORGANIZED PROBLEM	ANSWER

     30 x 6 		   3 x 6 x 10		  180

     400 x 8		   4 x 8 x 100		  3200

     4 x 300		   4 x 3 x 100		  1200

     6 x 2000		   6 x 2 x 1000		  1200
   
     7 x 600		   7 x 6 x 100		  4200
To solve these problems we multiple the first number of our multiple of ten by the single digit value and then we multiply that product by the multiple of ten to arrive at our final product. 

   MULTIPLE OF TEN	SINGLE DIGIT

      3000	    x	   4

   REORGANIZED:

       3 x 4 x 1000

   ANSWER:

       12000

You get to try a few for yourself on the next page.

Continue to next page of lesson