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 In this method we add a 2-digit number and a single-digit

number mentally or without crossing to the next ten, such

as 35 + 4 or 61 + 5. They add "within" the same ten.

+ + +

= 12 + 7 = 19 =
25 + 34 +
3 28 4 38
Add 2 + 7 first.

Add 5 + 3 first. The ten does not Add 4 + 4 first.
The 2 tens do not change. The 3 tens do not

change. change.

 We also learn to write them under tens and ones if adding

vertically.

 Ex: 65+3= 68

Tens Ones
6 5

+ 3
6 8

As 3 is a single digit number it is written under ones and
65 is written under tens and ones.

Learning outcome- Students are able add 2 digit numbers

without carryover under tens and ones.