Add With Mental Math

Add with Mental Math: Learn

How to mentally add two two-digit numbers:

Example: Add 84 and 35

  • First add the two ones' place digits (4 + 5 = 9)
  • Next add the two tens' place digits (8 + 3 = 11)
  • The sum of the ones' place digits is less than ten so the answer is 119

Example: Add 94 and 67

  • First add the two ones' place digits (4 + 7 = 11)
  • Next add the two tens' place digits (9 + 6 = 15)
  • The sum of the ones' place digits is a two-digit number so...
  • decrease the ones' place sum by 10 (11 - 10 = 1)
  • increase the tens' place sum by 1 (15 + 1 = 16)
  • Combine the tens' and ones' place sums to give the answer of 161

Add with Mental Math: Practice

What is the Sum of the two Numbers?

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