Gillian started to find 888-291. this is what she did. 888 - 291 = ? 888 - 300 = 588 what should gillian do next?

597

Step-by-step explanation:

888 - 291 = ?

888 - 300 = 588

Subtracting 300 is 9 too many, so Gillian should add 9 back

588+9 = 597

So we start with 888 -291.

Gillian does 888 - 300 = 588. so what she did there is round the 291 up to 300.

So the next steph would be make 588 - 9 = 581.

A better way to write this is

888 - 291 = 888 - 291 + 9- 9 = 888 - 300 -9 = 581.

In this equations always is useful to round up or down some number so its more easy the equation, en then subtract or sum the correspondent number.