Maya collects stamps.She has 20 stamps in her collection . Four-fifth of her stamps have been canceled.How many of the stamps in Maya’s collection have been canceled

Question

• Find 4/5 of 20.

• Put 20 counter on your Mathboard

since you want to find 4:5 of the stamps you should arrange the 20 counters in ______ equal groups

• Draw the counters in equal groups below. How many counters are in each group ?

• Each represents ______ of the stamps

Circle 4/5 of the counters

How many groups did you circle ?

How many counters did you circle ?

4/5 of 20 = , or 4/5 X20 =

So , ______ of the stamps have been canceled.

Answer 1

4/5 * 20 = 4/5 * 20/1 = 80/5 = 16

OR

4/5 * 20/1 = 4/1 * 4/1 <---- 20 cancels the 5 by a factor of 4

= 16

16 have been cancelled

4 remain