Miranda needs to add 68 + 19 mentally but is struggling. If she knows that 68 + 20 = 88, how can she use this to help?

She can use 68 + 20 = 88 to help by noticing that the 20 is ahead of 19 by 1. She can easily mentally turn the 20 into a 19 and realized that the 88 would become 87.

Hello Amontessemprit,

$1.00 = 1

How I got my answer,

Rewrite the decimal number as a fraction with 1 in the denominator
$1.00 = $1.00/1

Multiply to remove 0 decimal places. Here, you multiply top and bottom by 10^0
$1.00/1 × 1/1 = 1/1

Simplify the improper fraction, = 1

In conclusion, $1.00 = 1