Question

Erica used friendly numbers to find 43-19 she added 1 to 19 and subtracted 1 from 43 what is Erica's error

Answer 1

42-20=22 ---- I'm pretty sure that's the answer you're looking for.

Answer 2

Her error was that she subtracted from the 43 when she should have added also to the 43 by 1 number. 44-20=24 hope this helps