Page 201 - New Medley 2 Semester 1

Adding Three One Digit Numbers

(Preparing to Carry)

Let us add 4, 5 and 6

4 ones + 5 ones + 6 ones = 4 ones + [5 ones + 6 ones]
= 4 ones + 11 ones

= 15 ones
= 10 ones + 5 ones

= 1 ten + 5 ones
(We know that 10 ones = 1 ten)

EXERCISE 2.3

Add the following.

1. 5 ones + 1 one + 7 ones 2. 4 ones + 6 ones + 3 ones

= ones + [ one + ones] = ones + [ ones + ones]

= ones + ones = ones = ones + ones = ones

= ones + ones = ones + ones

= ten + ones = ten + ones

3. 4 ones + 2 ones + 8 ones 4. 7 ones + 2 ones + 6 ones

= ones + [ ones + ones] = ones + [ ones + ones]

= ones + ones = ones = ones + ones = ones

= ones + ones = ones + ones

= ten + ones = ten + ones

5. 7 ones + 3 ones + 8 ones + 6 ones

= [ ones + ones] + [ ones + ones]

= ones + ones = ones

= ones + ones

= tens + ones

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