This is a word problem that involves fractions:

Tom had a birthday party, and invited his friends Billy and Rob. Rob Couldn’t come to the party, but Tom told Rob he’d save him some food. Tom bought a 12-slice pizza and a 6-piece cake, both are the same size. Tom had 4 pieces of pizza and 3 slices of cake, Billy had 6 slices of pizza and 1 slice of cake.

a) How much pizza and cake did Tom and Billy eat? together?

b) How many pizza-sized slices of cake and pizza is left for Rob?

Answers:

a)

Tom:

Tom ate 10/12 of a whole cake/pizza

4/12 + 3/6 (2/2)

=4/12 + 6/12

= 10/12

Billy:

Billy ate 8/12 of a whole cake/pizza

6/12 + 1/6 (2/2)

= 6/12 + 2/12

= 8/12

Together:

Together Rob and Tom ate 1 ½ of a full pizza/cake.

8/12 + 10/12

= 18/12

=1 ½

b)

Rob gets 6/12 pizza-sized slices of pizza and cake, Rob gets 1/2 a full pizza/cake.

24/12 – 18/12

= 6/12

=1/2