most accurate estimation of 54-16
Round 54 to 50 because the 4 in 54 is less than 5. 16 is round up to 20 because the 6 is bigger than 5 so the math question is 50-30=20
Take the 4 off of 54 and add it to 16 to make 20. So your equation is 50-20= 30
