Question

Shin used a doubling and halving strategy to solve 25 times 68. Fill in the blanks in the arrays and the equations to represent her work

Answer 1

`25 * 68 = 1700`

Explanation:

Given

`25 * 68`

Required

Fill the array using doubling and halving

Question is incomplete, as the array is not given.

However, the solution is as follows:

`25 * 68`

Double 25 and half 68

`25 * 68 = 50 * 34`

Double 50 and half 34

`25 * 68 = 100 * 17`

The above is now easy to solve

`25 * 68 = 1700`