4.)star liked to practice her number sense when possible. She
wanted to add two 2 digit numbers in her head. She thought 50 + 10
= 60 and 6+ 7 = 10 + 3. Then she was able to write down the correct
answer. Which problem was she solving?

56 + 17

Step-by-step explanation:

The numbers could be

56 + 17   because Star was separating how she added the decimal places

She added the tens units first and then the ones units last.

so   50 + 10   first

and then 6 + 7

1,150 give brainliest

step-by-step explanation

2r= 2300

r =1150

step-by-step explanation:

hans did not square the 40-unit side; he merely multiplied it by 2.   incorrect.