Step by Step
What is the first step in rounding decimals?
Find the rounding place.
Underline the rounding digit to the nearest tenths place.
0.45
4
What is another word for rounding?
estimating
Round 0.87 to the nearest tenth.
0.90 or 0.9
What is mental math?
Math that you can do easily in your head.
What do you do after you've found the rounding place?
Look at the digit to the right of the rounding place.
Underline the rounding digit to the nearest hundreths place.
1.762
6
What is the number in word form?
.17
seventeen hundreths
Round 0.678 to the nearest hundredths place.
0.68
What are compatible numbers?
Numbers that are easy to compute with mentally.
What should you do to the right of the rounding place if it is 5 or greater?
Add 1 to the rounding place.
Underline the rounding digit to the nearest ones place.
6.73
6
Read the number in word form.
32.65
Thirty- two and sixty five hundreths
Round 196 to the nearest tens place.
200
What property of addition states that addends can be regrouped and the sum remains the same?
Associative Property of Addition
If I wanted to round 11.675 to the nearest tenths place, and I underline the 6, what are the next steps?
Look at the digit to the right (7). It is 5 or more so add 1 to the rounding place (6). Everything behind it drops. 11.7
Underline the rounding digit to the nearest tens place.
56.8
5
Rounding does not give you an exact correct answer. It tells you what?
About how many or how much
What is 7.876 rounded to the nearest whole number?
8 or 8.0
What property of Addition states that addends can be added in any order and the sum will remain the same.
Commutative Property of Addition
How would you use compensation to find the sum?
29+50=
Add 1 to the 29 to make it 30, add 30 and 50, then subtract 1 to balance out the 1 you added to 29.
29+50=79
Underline the rounding digit to the nearest hundreds place.
231.9
2
Read the number in word form.
654.75
six- hundred fifty- four and seventy- five hundreths.
Round 8.963 to the nearest tenths place
9
Kenthadius wants to purchase a comic book for $5.25, a figurine for $8.35 and a hat for $10.00. If the cashier rings up the hat, figurine the the comic book, will the price be the same as if she rings up the comic book, the hat, then the figurine? Why or why not? (What property of Addition supports your answer)
Yes it will.
The commutative property of addition states that addends can be added in any order and the sum will remain the same.