Mental Strategies for Addition | Grade 2 | Learning Concepts
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Mental Maths

Mental Addition Strategies

What is mental addition?

  • Mental addition means to do the addition of numbers in your head mentally without using a pen paper or any machine.
  • Mental addition tricks help us to do addition faster and easily.

We will learn some easy methods to do addition fast.

G2_1_Mental Addition_ Strategies

Addition of 1-digit and 2-digit numbers

  • Addition by making 10.

    • We use number bonds of 10.
      G2_2_Mental Addition_ Addition by making 10
    • In the above example, we know that the number bond of
      10 as 7 + 3 = 10
    • So, we take away 3 from 29 and add it to 7.
    • 29 becomes 26. We can split it as 20 + 6.
    • Now adding 10 + 20 + 6, we get 36.
  • Addition by splitting

    • Split two-digit numbers into tens and ones.
      G2_3_Mental Addition_ Addition by splitting
    • In the above example, we can split the number 13 as one 10 and 3 ones.
    • Then we can add 5 + 3 = 8.
    • Now adding this 8 to 10, we get 18.

Addition of 2-digit numbers

  • Addition of tens numbers.

    • Add the Tens place numbers only.
    • In the above example, Ones place numbers are 0. We know that, 0 + 0 = 0. So, ones place number will be always 0.
    • Then directly add tens place numbers here: 3 + 6 = 9
    • We get sum as: 30 + 60 = 90
  • Another method (Count forward by observing tens-place numbers)

    • Between 30 and 60, the number 60 is greater.
    • The number 30 has 3 at its Tens place. So, from 60 count 3 steps forward in the form of tens.
      G2_5_Mental Addition_ Count forward
  • Addition by columns.

    • We add the numbers in the unit place and the numbers in the tens place separately. (Imagine numbers in column.)
      G2_6_Mental Addition_ Addition by column
    • In the above example, first we add Ones place digits. Remember this answer. This answer will be Ones place digit in the final answer.
    • Then add Tens place digits. This answer will be the Tens place digit of our final answer.

    Case 2: When we get sum of ones place digits as a 2-digit number

    • If we get 2-digit number as the sum of ones place digits, add one to the tens column answer.
      G2_7_Mental Addition_ Addition by carry over
    • In the above example, first we add Ones place digits:
      7 + 6 = 13.
      The number 3 in this 13 is our ones place digit number in the answer and we hold 1.
    • Then we add Tens place digit: 5 + 2 = 7
      We add that 1 to 7: 1 + 7 = 8
  • Addition by splitting

    • Split two-digit numbers into tens and ones.
      G2_8_Mental Addition_ Addition by splitting
    • In the above example, we split the number 23 as: 20 + 3
    • And split the number 14 as 10 + 4
    • Then add 1-digit numbers: 3 + 4 = 7
    • Then it is easy to add: 20 + 10 + 7 = 37
  • Addition by rounding off numbers into tens.

    • Here we rounded off one addend.
      G2_9_Mental Addition_ Addition by rounding off
    • In the above example, if we add 3 to 57, we get 60.
    • So, we take away 3 from 38 and added it to 57.
    • 57 became 60 and 38 became 35.
    • By adding 60 and 35, we got 95.
G2_10_Mental Addition_ Did you know
G2_11_Mental Addition_ Mind map
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