1. What is 423 rounded to the nearest hundred?
3.1 Count Equal Groups
Problem of the Day:
What is 423 rounded to the nearest hundred?
A) 430
B) 420
C) 400
D) 300

2. Equal groups have the same number of objects in each group.
3.1 Count Equal Groups
Equal groups have the same number of objects in each group.
Matchbox cars were invented in Tim has 6 Matchbox cars. Each car has 4 wheels. How many wheels are there in all?
Activity: Use counters to model the equal groups.

3. Step 1: Draw 4 counters in each group.
3.1 Count Equal Groups
Step 1: Draw 4 counters in each group.
Step 2: Skip count to find how many wheels in all.
Skip count by 4s until you say 6 numbers.
___ ___ ___ ___ ___ ___

4. There are ___ groups with ____ wheels in each group.
3.1 Count Equal Groups
There are ___ groups with ____ wheels in each group.
So, there are ____ wheels in all.

5. Example: Count equal groups to find the total.
Sam, Kyla, and Tia each have 5 pennies.
How many pennies do they have in all?
How many pennies does each person have?
How many equal groups of pennies are there?

6. Draw 5 counters in each group.
3.1 Count Equal Groups
Sam, Kyla, and Tia each have 5 pennies.
How many pennies do they have in all?
Draw 5 counters in each group.
Think: There are ___ groups of 5 pennies.
Think: There are ____ fives. 5

7. You can use place value to add two addends.
Example 1: Add
Estimate = ___.

8. You can use place value to add two addends.
Example 1: Add
Step 1: Add the ones. Regroup the ones as tens and ones.
236
+ 585

9. You can use place value to add two addends.
Example 1: Add
Step 2: Add the tens. Regroup the tens as hundreds and tens.
236
+ 585 1

10. You can use place value to add two addends.
Example 1: Add
Step 3: Add the hundreds
+ 585 21

11. So, Dante flies _____ miles.
1.7 Use Place Value to Add
= ______
So, Dante flies _____ miles.
Since _____ is close to the estimate of _____, the answer is reasonable.
You can also use the Commutative Property of Addition to check your work. Change the order of the addends and find the sum.
585
+ 236

12. Try This! Find 563 + 48 in two ways.
1.7 Use Place Value to Add
Try This! Find in two ways.
Estimate: = ____
A) Use the break apart strategy.
563 = ___ + ___
= ___
B) Use place value.
563
+ 48

13. Use place value to add three addends.
A) Add
Estimate: = ____
Step 1: Add the ones.
140
457
+ 301
Step 2: Add the tens. 8

14. Use place value to add three addends.
Estimate: = ____
Step 3: Add the hundreds.
140
457
+ 301 98
So, = ____

15. Use place value to add three addends.
B) Add
Estimate: = ____
Step 1: Add the ones. Regroup the ones as tens and ones.
173
102
+ 328
Step 2: Add the tens. Regroup the tens as hundreds and tens. 3

16. Use place value to add three addends.
Step 3: Add the hundreds.
173
102
+ 328 03
So, = ____

17. 1.7 Use Place Value to Add
Circle the problem in which you need to regroup. Use the strategy that is easier to find the sum. a b
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18. Estimate. Then find the sum. 2) Estimate: ____ 251 + 345
1.7 Use Place Value to Add
Estimate. Then find the sum.
2) Estimate: ____
251
+ 345
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19. Estimate. Then find the sum. 3) Estimate: ____ 479 + 395
1.7 Use Place Value to Add
Estimate. Then find the sum.
3) Estimate: ____
479
+ 395
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20. Estimate. Then find the sum. 4) Estimate: ____ 686 + 314
1.7 Use Place Value to Add
Estimate. Then find the sum.
4) Estimate: ____
686
+ 314
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21. Estimate. Then find the sum. 5) Estimate: ____ 231 410 + 158
1.7 Use Place Value to Add
Estimate. Then find the sum.
5) Estimate: ____
231
410
+ 158
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