It is easier to add one digit number and one digit number, when the result is less than 10.
Examples :
1 + 2 = 3
3 + 4 = 7
5 + 4 = 9
6 + 2 = 8
How to add one digit number and one digit number, when the result is greater than 10?
Consider the following addition
7 + 5
Here, 7 is close to the round figure 10. To make 7 as 10, we have to add 3 to 7. Take 3 from 5 and add it to 7 and do the rest of the process.
= 7 + 5
= 7 + 3 + 2
= 10 + 2
= 12
Write the given two digit number in terms of multiple of 10 and do the addition process as explained below.
Example 1 :
Evaluate :
12 + 5
Solution :
= 12 + 5
= 10 + 2 + 5
= 10 + 7
= 17
Example 2 :
Evaluate :
14 + 8
Solution :
Here, 8 is close to the round figure 10. To make 8 as 10, we have to add 2 to 8. Take 2 from 14 and add it to 8 and do the rest of the process.
= 14 + 8
= 12 + 2 + 8
= 12 + 10
= 22
Write the given two digit numbers in terms of multiple of 10 and do the addition process as explained below.
Example 3 :
Evaluate :
13 + 14
Solution :
= 13 + 14
= 10 + 3 + 10 + 4
= 10 + 10 + 3 + 4
= 20 + 7
= 27
Example 4 :
Evaluate :
15 + 16
Solution :
= 15 + 16
= 10 + 10 + 5 + 6
= 10 + 5 + 10 + 6
= 20 + 11
= 31
Example 5 :
Evaluate :
16 + 19
Solution :
Here, 19 is close to the round figure 20. To make 19 as 10, we have to add 1 to 19. Take 1 from 16 and add it to 19 and do the rest of the process.
= 16 + 19
= 15 + 1 + 19
= 15 + 20
= 35
Example 6 :
Evaluate :
27 + 14
Solution :
Here, 27 is close to the round figure 30. To make 27 as 30, we have to add 3 to 27. Take 3 from 14 and add it to 27 and do the rest of the process.
= 27 + 14
= 27 + 3 + 11
= 30 + 11
= 41
Addition Table for 1 1 + 1 = 2 2 + 1 = 3 3 + 1 = 4 4 + 1 = 5 5 + 1 = 6 6 + 1 = 7 7 + 1 = 8 8 + 1 = 9 9 + 1 = 10 10 + 1 = 11 Addition Table for 3 1 + 3 = 4 2 + 3 = 5 3 + 3 = 6 4 + 3 = 7 5 + 3 = 8 6 + 3 = 9 7 + 3 = 10 8 + 3 = 11 9 + 3 = 12 10 + 3 = 13 Addition Table for 5 1 + 5 = 6 2 + 5 = 7 3 + 5 = 8 4 + 5 = 9 5 + 5 = 10 6 + 5 = 11 7 + 5 = 12 8 + 5 = 13 9 + 5 = 14 10 + 5 = 15 Addition Table for 7 1 + 7 = 8 2 + 7 = 9 3 + 7 = 10 4 + 7 = 11 5 + 7 = 12 6 + 7 = 13 7 + 7 = 14 8 + 7 = 15 9 + 7 = 16 10 + 7 = 17 Addition Table for 9 1 + 9 = 10 2 + 9 = 11 3 + 9 = 12 4 + 9 = 13 5 + 9 = 14 6 + 9 = 15 7 + 9 = 16 8 + 9 = 17 9 + 9 = 18 10 + 9 = 19 Addition Table for 11 1 + 11 = 12 2 + 11 = 13 3 + 11 = 14 4 + 11 = 15 5 + 11 = 16 6 + 11 = 17 7 + 11 = 18 8 + 11 = 19 9 + 11 = 20 10 + 11 = 21 Addition Table for 13 1 + 13 = 14 2 + 13 = 15 3 + 13 = 16 4 + 13 = 17 5 + 13 = 18 6 + 13 = 19 7 + 13 = 20 8 + 13 = 21 9 + 13 = 22 10 + 13 = 23 Addition Table for 15 1 + 15 = 16 2 + 15 = 17 3 + 15 = 18 4 + 15 = 19 5 + 15 = 20 6 + 15 = 21 7 + 15 = 22 8 + 15 = 23 9 + 15 = 24 10 + 15 = 25 Addition Table for 17 1 + 17 = 18 2 + 17 = 19 3 + 17 = 20 4 + 17 = 21 5 + 17 = 22 6 + 17 = 23 7 + 17 = 24 8 + 17 = 25 9 + 17 = 26 10 + 17 = 27 Addition Table for 19 1 + 19 = 20 2 + 19 = 21 3 + 19 = 22 4 + 19 = 23 5 + 19 = 24 6 + 19 = 25 7 + 19 = 26 8 + 19 = 27 9 + 19 = 28 10 + 19 = 29 |
Addition Table for 2 1 + 2 = 3 2 + 2 = 4 3 + 2 = 5 4 + 2 = 6 5 + 2 = 7 6 + 2 = 8 7 + 2 = 9 8 + 2 = 10 9 + 2 = 11 10 + 2 = 12 Addition Table for 4 1 + 4 = 5 2 + 4 = 6 3 + 4 = 7 4 + 4 = 8 5 + 4 = 9 6 + 4 = 10 7 + 4 = 11 8 + 4 = 12 9 + 4 = 13 10 + 4 = 14 Addition Table for 6 1 + 6 = 7 2 + 6 = 8 3 + 6 = 9 4 + 6 = 10 5 + 6 = 11 6 + 6 = 12 7 + 6 = 13 8 + 6 = 14 9 + 6 = 15 10 + 6 = 16 Addition Table for 8 1 + 8 = 9 2 + 8 = 10 3 + 8 = 11 4 + 8 = 12 5 + 8 = 13 6 + 8 = 14 7 + 8 = 15 8 + 8 = 16 9 + 8 = 17 10 + 8 = 18 Addition Table for 10 1 + 10 = 11 2 + 10 = 12 3 + 10 = 13 4 + 10 = 14 5 + 10 = 15 6 + 10 = 16 7 + 10 = 17 8 + 10 = 18 9 + 10 = 19 10 + 10 = 20 Addition Table for 12 1 + 12 = 13 2 + 12 = 14 3 + 12 = 15 4 + 12 = 16 5 + 12 = 17 6 + 12 = 18 7 + 12 = 19 8 + 12 = 20 9 + 12 = 21 10 + 12 = 22 Addition Table for 14 1 + 14 = 15 2 + 14 = 16 3 + 14 = 17 4 + 14 = 18 5 + 14 = 19 6 + 14 = 20 7 + 14 = 21 8 + 14 = 22 9 + 14 = 23 10 + 14 = 24 Addition Table for 16 1 + 16 = 17 2 + 16 = 18 3 + 16 = 19 4 + 16 = 20 5 + 16 = 21 6 + 16 = 22 7 + 16 = 23 8 + 16 = 24 9 + 16 = 25 10 + 16 = 26 Addition Table for 18 1 + 18 = 19 2 + 18 = 20 3 + 18 = 21 4 + 18 = 22 5 + 18 = 23 6 + 18 = 24 7 + 18 = 25 8 + 18 = 26 9 + 18 = 27 10 + 18 = 28 Addition Table for 20 1 + 20 = 21 2 + 20 = 22 3 + 20 = 23 4 + 20 = 24 5 + 20 = 25 6 + 20 = 26 7 + 20 = 27 8 + 20 = 28 9 + 20 = 29 10 + 20 = 30 |
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