Grade 4 - Progress in Mathematics

Add Larger Numbers

3-4

The Botanical Gardens held a

two-day open house. What was

the total attendance at the

open house?

First, use rounding to estimate: 17,465 
16,592

20,000 
20,000 40,000

Then add: 17,465 
16,592.

Add the ones. Add the tens. Add the hundreds.

Regroup. Regroup.

1 1 1

1 7 , 4 6 5 1 7 , 4 6 5 1 7 , 4 6 5


1 6 , 5 9 2 
 1 6 , 5 9 2 
1 6 , 5 9 2

7 5 7 0 5 7

15 tens  10 hundreds 

1 hundred 5 tens 1 thousand 0 hundreds

Add the thousands. Add the ten thousands.

Regroup.

1 1 1 1 1 1

1 7 , 4 6 5 1 7 , 4 6 5


 1 6 , 5 9 2 
 1 6 , 5 9 2

4,0 5 7 3 4 , 0 5 7

The total attendance was 34,057.

Think

34,057 is close to 40,000.

The answer is reasonable.

14 thousands

1 ten thousand 4 thousands

Attendance

Saturday 17,465

Sunday 16,592

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