1. Review Rounding Write & Evaluate Expressions
Estimate Sums & Differences
Addition & Subtraction

2. Find the Place Value and Round

3. Increase by one or stays the same
Where do I look first?
Round this number to the nearest hundred
368
Look at the number to the right of the action
Action
Increase by one or stays the same

4. Use rounding When the question asks you to estimate. Such as:
“about how many”…?
When an exact answer isn’t possible.
When an answer is difficult to obtain.
(Educated guessing for multiple choice)

5. Rounding Procedures
1. Draw an arrow pointing to the place you are rounding. (action)
2. Draw a dot (an eye) under the digit to the right of the place you are rounding.

6. Rounding Procedures
3. If the digit is 0-4, the number with the arrow stays the same. The rest of the numbers to the right change to 0’s.
4. If the digit is 5-9, the number with the arrow rounds up one. The rest of the numbers to the right turn to 0’s.

7. Rounding Rhyme
Ut ohhh!
5,621
5620
Mark the place,
Look to the right
Four or less are out of sight
Five and up
Will buy one more,
All those less, are out the door
In those empty
Right-hand spaces,
Zeros keep the proper places
Except in places less than a whole
Such as the decimal case
The last number is the last place
Oh yea! I’m moving up Wahoo!
5,621
6,000
Every place to the right of the arrow changes to zeros
No zero place holder for me
2.88
2.9

8. Round to the nearest hundreds place.

9. 1-4 stay down
5-9 round up one
Answer 4,600

10. Answer 4,700

11. Answer 4,600

12. Round 2,593, 672 to the nearest tens place.
1-4 stay down
5-9 round up one
Answer 2,593,670

13. Round to the nearest tenth place.

14. 1-4 stay down
5-9 round up one

15. Answer 4.700

16. Answer 4.600

17. Round each number to the place that has an arrow.
500
923,749,100,000
5,289
239.1 30

18. Practice Rounding 269 (tens) 2.98 (ones) 3,146 (tens)
.912 (hundredths)
86,574 (ten thousands)
(hundreds)
411,990 (hundreds)

19. Answers 269 (tens) 2.98 (ones) 3,146 (tens) .912 (hundredths)
86,574 (ten thousands)
(hundreds)
411,990 (hundreds)
270 3
3,l50
.91
90,000
200.00
412,000

20. Round Numbers 64
873
491
652
957
203
684

21. Answers 64
873
491
652
957
203
684 60
870 or 900
490 or 500
650 or 700
960 or 1,000
200
680 or 700

22. Estimate Sums & Differences
Round off both numbers then add or subtract.
= ?
= 120
691 – 54 = ?
700 – 50 = 650

23. Math Words Place-The position of a digit in a number.
Value- The product of a digit multiplied by its place.
Standard Form-The usual way to write a number
Expanded Form-A way to write a number as a sum of the products of each digit and its place.
Whole number-any one of the numbers 0, 1, 2, 3, 4, and so on.

24. Math Words
Decimal-A number with one or more digits to the right of the decimal point.
Equivalent decimals- Decimals that name the same number such as .4, .40, .400
Round-To find the nearest value of a number, based on the given place.
Estimate-To find a number that is close to the exact answer.
Variable-A symbol used to represent a number or numbers

25. Math Words Algebraic Expression -
A variable by itself or a combination of one or more variables, one or more operations, and possibly one or more numbers such as
n + 2
Evaluate or evaluation - To find the value of an expression by performing the operation or operations.
For Example
n = 3, n + 2
3 + 2 = 5

26. Practice