Question

I have 10 minutes, Help! Joani has some stuffed animals. She has 2 times as many as Lily. Lily has 6 stuffed animals. Joanie gave 2 away and bought 4 more. How many stuffed animals does Joani have now?

Students's solution: Lily has 6 stuffed animals, so Joani had 6 × 2 to begin with. So Joani had 12 stuffed animals. She gave away 2, so 12 – 2 = 10. She bought 4, so 10 + 4 = 14. So Joani has 14 stuffed animals.

Here is another problem that can also be solved by working backwards.

Wyatt has 3 times as many baseballs as golf balls. He has 5 fewer tennis balls than baseballs. Wyatt has 4 golf balls.



How many tennis balls does Wyatt have?

Answer 1

"Wyatt has 3 times as many baseballs as golf balls. He has 5 fewer tennis balls than baseballs. Wyatt has 4 golf balls."
3 times as many baseballs as golf balls; 4x3=12; 12 baseballs
5 fewer tennis balls than baseballs; 12-5=7; 7 tennis balls

7 tennis balls

Answer 2

The answer is: (6x2) - 2= 10 +4=14