Mental Subtraction Strategies | Orchids International School
Job Alert : To view our Careers Page Click Here X
info@orchids.edu.in (+91) 8-888-888-999
ORCHIDS The International School

Mental Maths

Mental Subtraction Strategies

What is subtraction?

  • To find the difference between any numbers.

We will learn some easy methods to do subtraction mentally.

G1_1_Mental subtraction_Strategies

Subtract 1-digit number from 1-digit number

  • Subtraction by counting forward

    • Consider the second number (Subtrahend) and count the number of steps forward till getting first number (Minuend).

      Example:

      G1_2_Mental subtraction_Subtraction by counting forward

      Method:

      G1_3_Mental subtraction_Subtraction by counting forward
    • In the above example, we start counting from number 5 till getting the number 8.
    • Then count the number of steps that we have counted forward.
      So, we get:
      G1_4_Mental subtraction_Subtraction by counting forward
  • Subtraction by counting backwards

    • Consider the first number (Minuend) and count the number of steps backwards equal to the second number (Subtrahend).

      Example:

      G1_5_Mental subtraction_Subtraction by counting backward

      Method:

      G1_6_Mental subtraction_Subtraction by counting backward
    • In the above example, we start counting backwards from the number 7.
    • We have subtrahend as 3, so we count 3 steps backwards.
    • We reached at number 4. It is our answer.
    • This method will make our subtraction easier.
      So, we get:
      G1_7_Mental subtraction_Subtraction by counting backward

Subtract 1-digit number from 2-digit number

  • Subtract any 1-digit number from 10 using number bonds of 10.

    • We use here number bonds of 10.

      Example:

      G1_8_Mental subtraction_Subtraction using number bond

      Method:

      G1_9_Mental subtraction_Subtraction using number bond
    • In the above example; we know that, if we add 3 to 7, we get 10. (Number bond of 10: 7 + 3 = 10)
    • So, here 7 is 3 less than 10.
      So, we get:
      G1_10_Mental subtraction_Subtraction using number bond

      Example 2:

      G1_11_Mental subtraction_Subtraction using number bond

      Method:

    • In the above example; we know that, if we add 8 to 2, we get 10. (Number bond of 10: 2 + 8 = 10)
    • So, here 2 is 8 less than 10.
      So, we get:
      G1_12_Mental subtraction_Subtraction using number bond
  • Subtraction by splitting of 2-digit number into tens and ones

    • Split 2-digit number into Tens and Ones, make subtraction of Ones.

      Example:

      G1_13_Mental subtraction_Subtraction by splitting

      Method:

      G1_14_Mental subtraction_Subtraction by splitting
    • In the above example, we split 28 into 20 Tens and 8 Ones.
    • Then subtract 5 from 8 Ones. We get 3.
    • Adding 20 Tens and 3 Ones, we get 23.

Did you know?

G1_15_Mental subtraction_Did you know

G1_16_Mental subtraction_Mind map
  • -

    Admission Enquiry

    A Journey To A Better Future Begins With Us

    Get 100% Off On Admission Fee Now