Add thousands, hundreds, tens and ones separately.

Add hundreds, tens and ones separately.

Take 87 as 80 and 7, then subtract 80 first from 112.

Identify the keywords and think, which operation do we need to use.

Identify the keywords and think, which operation do we need to use.

Add hundreds, tens and ones separately.

Identify the keywords and think, which operation do we need to use.

First add ones to the number and then tens.

Subtract 100 from 403, then add 1.

Split the number into hundreds, tens and ones and then add hundreds, tens and ones separately.