Addition Problems
78 + 47
125
265 - 191
74
Show this value using place value blocks and expanded form:
345
300 + 40 +5
3 hundreds + 4 tens + 5 ones
The numbers you add together in an addition problem are called....
Addends
A letter or a symbol is used to represent a number is called a _______
variable
465 + 238
703
1001 - 482
519
Round 12,478 to the nearest hundreds place
12,500
Step 1. Add the tens
Step 2. Add the ones
False
We start with the ones place!
1. Add the ones
2. Add the tens
3. Add the hundreds
A series of steps used to solve a problem is called an _______
algorithm
1,482 + 2,618
4,100
1,325 - 838
487
What number shows a 4 that is 100 times larger than another 4?
a. 44,394
b. 36,441
c. 54,744
d. 748,942
c. 54,744
40 x 100 = 4,000
Show how you would use an adding on mental strategy for this problem.
325 + 103
325 +103
325 + 100 = 325
325 + 3= 328
Property of addition that states changing the grouping of addends does not change the sum.
Example: 2 + (3+4) = (2+3) + 4
Associative Property of Addition
12,693 + 7,248
19,941
31,709
Use an estimation to see if 991 is a reasonable answer. Show your work!
755 + 236
755 + 236
Rounded to the nearest ten: 750 + 240 = 990
Rounded to the nearest hundred: 800 + 200 =1,000
It is reasonable!
4+2 = 6
6-2 =4
True or false: This is an example of an inverse operation
True - this is an inverse operation!
True or False: The commutative property of addition means you can add in any order and still get the same answer.
True!
4+3 = 3+4
45,678 + 23,487
69,165
57,489 - 43,647
13,842
Draw a picture or show with place value blocks how you would regroup in this problem:
234 - 152
2 hundreds + 3 tens + 4 ones
Regrouped to
1 hundred + 13 tens + 4 ones
This way of solving a problem is a mental math method known as _______.
1,985 + 2,595 = (1,985 + 15) + (2,595 -15)
=2,000 +2,580
=4,580
Compensation
This property of addition states that any number plus zero will still be the original number
Example: 122 +0 = 122
Identity Property of Addition