Mental Addition Strategies | Orchids International School
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Mental Addition Strategies

We will learn some easy methods to do addition mentally.

G1_1_Mental Sub_Addition Tricks

Addition of 1-digit numbers

  • Addition by counting forward
    • Consider the first number and count the number of steps forward as equal to the second number.

    Example:

    G1_2_Mental Sub_Example

    Method

    We will start from number 2 and count 5 steps forward.

    G1_3_Mental Sub_Answer

    So, we get:

    G1_4_Mental Sub_Answer

  • Addition by counting forward from a larger number
    • Find out the larger number between addends and count forward from that number.

    Example:

    G1_5_Mental Sub_Example

    Method

    G1_6_Mental Sub_Answer
    • If we count from 3, we have to count 6 steps forward but if we count from 6, we have to count 3 steps forward.
    • This method will make our addition faster.

    So, we get:

    G1_6_Mental Sub_Answer

  • If numbers are the same, do addition by doubling it.
    • If addends are the same, double that number.

    Example:

    G1_7_Mental Sub_Example

    Method

    G1_8_Mental Sub_Answer
    • In the above examples, we can easily count a table of given numbers up to 2. (i.e. 4 twos are 8, 3 twos are 6).
    • Instead of adding the same number twice, we can multiply that number by 2. It will give the same answer.

    So, we get:

    G1_9_Mental Sub_Answer

  • If numbers are close, do addition by double the number.
    • If two numbers are close to each other, double the smaller number.

    Example:

    G1_10_Mental Sub_Example

    Method

    G1_11_Mental Sub_Answer
    • In the above example, 8 is close to 6, but 8 is 2 bigger than 6.
    • So, first we add 6 + 6. Here we can double the number 6 and make addition easy.
    • After getting 6 twos are 12, we can add 2. (Simply count 2 steps forward from 12)
    • And we got our answer. This method will make addition faster.

    So, we get:

    G1_12_Mental Sub_Answer

  • Adding numbers by making up 10.
    • We use number bonds of 10.
    • Following are the number bonds of 10.
    • G1_13_Mental Sub_Number bonds

    Example:

    G1_14_Mental Sub_Example

    Method

    G1_15_Mental Sub_Answer
    • In the above example, we know that adding 8 and 2 will get 10.
    • So, we took away 2 from 5, and add it to 8. It will give us 10.
    • If we take away 2 from 5, we will get 3.
    • Now add 10 and 3, it will give us 13.
    • Adding 10 plus 3 is easier than adding 8 plus 5.

    So, we get:

    G1_16_Mental Sub_Answer

  • Addition of any number with 9.
    • We use the following number bond of 10:
    • 1 and 9 = 10

    Example:

    G1_17_Mental Sub_Example

    Method

    G1_18_Mental Sub_Answer
    • In we have to add any number to 9, just remove 1 from that number and add it to 9.
    • We get, 9 + 1 = 10.
    • After removing 1 from the given number, it is easy to add the remaining number to 10. (Take the number that comes before number.)

    So, we get:

    G1_19_Mental Sub_Answer

Addition of 1-digit number and 10

  • Addition of any 1-digit number with 10.
    • We use the fact that if we add any number to 0 we get that same number as answer.

    Example:

    G1_20_Mental Sub_Example

    Method

    G1_21_Mental Sub_Answer
    • In the above example, we have to add Ones place numbers.
    • The number 10 has 0 in its Ones place.
    • Adding any number to 0 gives us that number itself as an answer.
    • So, to add any 1-digit number to 10, just replace the number 0 in 10 with that 1-digit number.

    So, we get:

    G1_22_Mental Sub_Answer

G1_23_Mental Sub_Did you know

G1_24_Mental Sub_Mindmap
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