What is 75 rounded to the nearest 10?
80
235 + 405 =
640
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
This property says that any number plus zero equals the other number.
8 + 0 = 8
Identity Property
Subtraction and addition are _____________________.
opposites
What is 1,546 rounded to the nearest 10?
What is the difference?
865 - 300 =
565
Find the difference using the break apart strategy.
687 = 600 + 80 + 7
- 121 = 100 + 20 + 1
566
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
What four math equations do you know from this fact family triangle?
3 + 4 = 7
4 + 3 = 7
7 - 3 = 4
7 - 4 = 3
What is 4,381 rounded to the nearest 100?
4,400
Which of these is NOT a strategy for addition?
using properties of addition to help
division
number line
break apart
division
Use a number line to find the sum.
35 + 42 =
77
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
Use the hat trick to solve this problem.
900
- 311
Subtract 1 from 900.
899
- 311
588 + 1 = 589
What is 34 rounded to the nearest 100?
0
352 miles
Use mental math to find the difference.
80 - 20 =
60
True or False?
Properties of Addition work for subtraction too.
FALSE
y - 301 = 400
What is the value of y?
701
Elaine needs to round 683 to the nearest hundred. Draw a number line that would BEST help Elaine find the answer.
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
How can you use addition to check your answer for this problem?
791
- 134
657
657
+ 134
791
True or False?
This is an example of the Commutative Property.
9 + 0 = 9
FALSE
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