Question

Please.please helpclick an image and answer with an explanation

Answer 1

When you estimate, make your numbers easy.  I would round 2.12 to 2 and 58 to 60.  then you would have 2 * 60 = 120 which would be close to 122.96

Answer 2

You can estimate by rounding up with a whole number and round up or down with a decimal. 2.12 would be rounded down to 2 and 58 would be rounded up to 60 and your answer would be rounded to 120 your equation would like this
2x60=120