On Monday, Heidi bought some grapes. Each day, she ate half of them. On Friday, only eight grapes were left. How many grapes did Heidi buy? Use the Working Backwards method and SHOW YOUR WORK.
So Heidi bought an unknown number of grapes. There are four days between Monday and Friday. You have to multiply 8 by 2 for every day that passed. 8 times 2 is 16. 16 times 2 is 32. 32 times 2 is 64. 64 times 2 is 128. So your answer will be 128 grapes.
