To add 2/3 + 3/5 using 15 soup cans, what common denominator would be easiest?
8
10
15
30
How would you show each fraction using the 15 soup cans to add 2/3 + 3/5?
2/3 is three equal groups of cans, circle 2 of them, and 3/5 is 5 equal groups, circle 3 of them.
2/3 is 2 equal groups of cans, circle 3 of them, and 3/5 is 3 equal groups, circle 5 of them.
Take 2 cans + 3 cans
How many cans would you have when using the 15 soup cans to add 2/3 + 3/5?
10 cans + 9 cans = 19 cans
4 cans + 6 cans = 10 cans
2 cans + 3 cans = 5 cans
How would you know whether you had more or less than 1 whole?
19 cans is more than one whole case of cans, so you have more than 1 whole.
10 cans is less than one case of cans, so you have less than one whole.
5 cans is less than one case of cans, so you have less than one whole.