Properties and Meaning
Review
Rounding and Estimating Sums
Adding 2-digit Numbers
Adding 3-digit Numbers
100
What is an Addend?
Numbers being added together.
100
How would you write the number 5,763 in expanded form?
5,000 + 700 + 60 + 3
100
Round to the nearest ten 85.
90
100
28 +25 _____
53
100
329 +468 _____
797
200
What is Sum?
Answer when adding.
200
A number written in a way that shows only its digits- 125
Standard Form
200
Round to the nearest hundred 149.
100
200
63 +19 _____
82
200
536 +399 _____
935
300
This is an example of what property? 7+5=5+7
Communitive Property
300
This separates dollars and cents.
A decimal point
300
Round to the nearest ten to estimate the sum. 28 + 46
80
300
53 + 72 =
125
300
645 + 79 _____
724
400
This is an example of what property? 5+0=5
Identity Property of Addition
400
Used to show order of people or objects.
Ordinal Number
400
Round to the nearest hundred to estimate. 114 + 58
200
400
There are 72 people on a train when 25 more people enter. How many people are on the train now?
97 people
400
36 +47 35 _____
118
500
This is an example of what property? (3+4)+7=3+(4+7)
Associative Property fo Addition
500
What place is the 6 in the following number? 672,113
Hundred Thousands place
500
Round to the nearest hundred to estimate. 462 +121 +345
900
500
Using four different digits, what is the least sum you can get when you add two 2- digit numbers?
33; 13 + 20=33 or 10+23=33
500
164+68+35=
267
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