rounding
addition and subtraction
strategies
properties of addition
FINAL JEOPARDY
100
What is 75 rounded to the nearest 10?
80
100
235 + 405 =
640
100
Which of these is a way to break apart 370 + 540? Choose ALL the right answers.
A. 300 + 70 + 500 + 40
B. 3 + 7 + 5 + 4
C. 30 + 70 + 50 + 40
D. 370 + 30 + 510
A. 300 + 70 + 500 + 40
D. 370 + 30 + 510
100
This property says that any number plus zero equals the other number.
8 + 0 = 8
Identity Property
100
Fill in the blank.
Subtraction and addition are _____________________.
opposites
200
What is 1,546 rounded to the nearest 10?
1,550
200
What is the difference?
865 - 300 =
565
200
Find the difference using the break apart strategy.
687 = 600 + 80 + 7
- 121 = 100 + 20 + 1
566
200
This property of addition says that you can GROUP numbers in any order and still get the same sum.
(6 + 5) + 1 =
6 + (5 + 1) =
(6 + 1) + 5
Associative Property
200
What four math equations do you know from this fact family triangle?
3 + 4 = 7
4 + 3 = 7
7 - 3 = 4
7 - 4 = 3
300
What is 4,381 rounded to the nearest 100?
4,400
300
Which of these is NOT a strategy for addition?
using properties of addition to help
division
number line
break apart
division
300
Use a number line to find the sum.
35 + 42 =
77
300
This property of addition says that you can put addends in any ORDER you like and still get the same sum.
5 + 6 = 6 + 5
Commutative Property
300
Use the hat trick to solve this problem.
900
- 311
Subtract 1 from 900.
899
- 311
588 + 1 = 589
400
What is 34 rounded to the nearest 100?
0
400
Coach K wants to walk 700 miles in one year. She has walked 348 miles so far. How many more miles does she have to walk to make her goal?
352 miles
400
Use mental math to find the difference.
80 - 20 =
60
400
True or False?
Properties of Addition work for subtraction too.
FALSE
400
y - 301 = 400
What is the value of y?
701
500
Elaine needs to round 683 to the nearest hundred. Draw a number line that would BEST help Elaine find the answer.
500
Marvin is trying to collect 250 marbles. His mom gave him 46 marbles for his birthday. How many more marbles does Marvin need?
204 more marbles
500
How can you use addition to check your answer for this problem?
791
- 134
657
657
+ 134
791
500
True or False?
This is an example of the Commutative Property.
9 + 0 = 9
FALSE
500
JT has a secret number.
The number is less than 500.
When rounded to the nearest hundred, the number in the hundreds place is 4.
The number in the ones place is LESS than the number in the tens place.
What is JT's number?
476 355 424 521
476