Grade 4 - Progress in Mathematics

Add with Regrouping

3-2

h t o

1

2 5 8


1 7 7

5

h t o

1 1

2 5 8


1 7 7

3 5

h t o

1 1

2 5 8


1 7 7

4 3 5

Remember:

10 ones 
1 ten

10 tens 
1 hundred

Find the sum of 258 177.

First, use rounding to estimate: 258 
 177 300 
 200  500

Then add: 258 
177.

Add the ones. Add the tens. Add the

Regroup. Regroup. hundreds.

15 ones  13 tens 

1 ten 5 ones 1 hundred 3 tens

The sum is 435.

Study these examples.

1 1 1 1

$.4 7 5 2 6 $1.7 3 6 5


 .2 9 
 2 3 7 
 6.5 4 
 7

$.7 6 7 6 3 $8.2 7 7 2

Think

435 is close to 500.

The answer is reasonable.

3.1

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