Mental Math: Find sums and differences
6,794 - 1,058 =
5,736
3,258 + 1,761 =
5,019
139,484 - 116,691 =
22,793
6,000 - 1,773 =
4,227
To give an approximate value rather than an exact answer.
Estimate
2,000 + 4,996 =
6,996
275,558 + 605,131 =
880,689
49,735 - 25,276 =
24,459
1,902 - 1,374 =
528
A process that determines which multiple of 10, 100, 1,000, and so on a number is closest to.
Rounding
7,100 - 827 =
6,273
30,080 + 19,187 =
49,267
42,648- 8,169 =
34,479
1,830 - 644 =
1,186
A number sentence that uses the equal sign (=) to show that two expressions have the same value.
Equation
9,100 + 2,130 + 900 =
12,130
29,634 + 12,958 + 6,835 =
49,427
215,714- 176,313 =
39,401
30,900 - 22,855 =
8,045
A symbol or letter that stands for a number.
Variable
426,100 + 74,900 =
501,000
Aubrey writes a blog. 29,604 people read her first post. The next week,47,684 people read her second post. Aubrey’s third post has 41,582 readers. What is the actual number of readers?
118,870
A crayon company makes 87,491 blue crayons, 36,262 red crayons ,and 25,063 gray crayons. How many more blue crayons are made than red and gray crayons combined?
26,166 blue crayons
790,008 - 643,829 =
146,179
A set of steps used to solve a math problem.
Algorithm