Grade 1 Math Addition: Two single-digit numbers

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Addition: Two single-digit numbers


What is single digit number?

Each number from 1 to 9 is called single or one digit number. The total single digit numbers are 9 (from 1 to 9). They are 1,2,3,4,5,6,7,8,9.

Addition of two single digit numbers:

If we add one single digit number with another single digit number, then it is called the addition of two single digit numbers.


Addition: Two Single Digit Numbers Sample Example:

A. Addition by counting the numbers of object.

1. Count the number of object to fill in the gap.

(i) ...+..... = ........

        3 + 5 = _________.

(ii) ...... + ...... = ..............

        4 + 4 = _________.

(iii) .. + ............ = ..............

        2 + 7 = _________.

(iv) ........ + .. = ............

        5 + 2 = _________.

(v) ...... + ............ = ....................

        4 + 7 = ________.

Answer:

(i) 8

(ii) 8

(iii) 9

(iv) 7

(v) 11


2. Look at the below pictures and fill in the blanks.

(i) ...... 4 +2 = _____.

(ii) . . . . . . . . 5 + 3 = ____.

(iii) . . . . . . . . .  7 + 3 = _____.

Answer:

(i) 6

(ii) 8

(iii) 10


B. Addition by counting the number of Lines.

1. Convert the numbers into lines and choose the right option.

(i) 3 + 2 =

p. ||||        q. |||||

r. ||           S. ||||||

(ii) 3 + 6 =

p. |||||       q. ||||||

r. |||         S. |||||||||

(iii) 1 + 4 =

p. ||||        q. |||||

r. ||           S. ||||||

Answer:

(i) q

(ii) s

(iii) q


2. Fill in the gap with a numeral.

(i) ||||| + | = ____.

(ii) |||| + ||| = ____.

(iii) ||||| + |||| = ____.

(iv) ||| + |||| = ____.

(v) ||||||| + |||| = ____.

Answer:

(i) 6

(ii) 7

(iii) 9

(iv) 7

(v) 11


C. Addition by Counting on Fingers.

1. Count the total number of two hand’s fingers.



Answer:

i) 5 + 2 = 7.

ii) 5 + 3 = 8.

iii) 5 + 3 = 8.

iv) 2 + 2 = 4.

v) 1 + 4 = 5.

vi) 3 + 2 = 5.


D. Find the sum of the following number sentences using number line.

i) 5 + 2 =

ii) 4 + 5 =

iii) 3 + 4 =

iv) 5 + 3 =

Answer:

Look at the number line:



(i) 5 + 2

Here, the first number is 5, find 5 in number line and then go forward 2 steps. Then you will get 7. So, 5 + 2 = 7.

(ii) 4 + 5

Here, the first number is 4, find 4 in number line and then go forward 5 steps. Then you will get 9. So, 4 + 5 = 9.

(iii) 3 + 4

Here, the first number is 3, find 3 in number line and then go forward 4 steps. Then you will get 7. So, 3 + 4 = 7.

(iv) 5 + 3

Here, first number is 5, find 5 in number line and then go forward 3 steps. Then you will get 8. So, 5 + 3 = 8.

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