Page 136 - NUMINO Challenge_D2

Problem solving Key Points

1 After three people, A, B, and C, give and take Complete the table
lollipops in order as shown below, all three of shown below by
them have 120 lollipops each. How many thinking backwards.
lollipops did each person have in the beginning?
Step The number of rollipops
A gives B as many lollipops as B has. C
B gives C as many lollipops as C has. Last step
C gives A as many lollipops as A has. Before step 3 120 120 120
Before step 2 60 120 180
Before step 1

2 Chris repeated the process of taking half of a coins Work backwards from
having two coins left
out from a piggy bank and then putting one coin at the end.

back in the piggy bank, 100 times. If there were two

coins left in the piggy bank at the end, how many

coins were in the piggy bank in the beginning?

133Communication