How to mentally subtract two two-digit numbers.
Subtract 35 from 84.
First subtract the two tens’ place digits (8 – 3 = 5)
Notice that the bottom ones’ digit is larger than the top ones’ digit. Decrease the answer for the tens’ place by one (5 – 1 = 4) and increase the top ones’ place value by 10 (4 + 10 = 14).
Next subtract the two ones’ place values (14 – 5 = 9)
Combine the tens’ and ones’ place differences to make 49.
Read the explanation below to learn more about practicing 2-digit subtraction.