SOL 4.4 Adding & Subtraction Study Guide
Vocabulary:
Sum - The answer in an addition problem
Difference – The answer to a subtraction problem
Number Sentence – An equation 3+4=7
Rounding - Reducing the digits in a number while trying to keep it's value similar
Estimation – Finding a value that is close enough to the correct answer
Word Problem Key Words:
Addition
Sum
Combined
Altogether
Total
In All
Both
Subtraction
Difference
fewer (“er”words)
How many more
less
Left
remains
Estimation
Closer to (than) A little more than
Between
A little less than
Best Described as
Examples:
Addition
1
Subtraction
1 1
67,397
+ 23,489
90,886
Actual Sum
70,000
+ 20,000
90,000
Estimated Sum
Check your work: 90,886
-23,489
67,397
7
12 18
3 8 17
782,497
800,000
-648,099
-600,000
134,398
100,000
Actual Difference
Estimated Difference
Check your work: 134,398
+648,099
782,497