Unit 1 Vocabulary
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Standard Form | A number written using digits and place value is in _________. | 2,174
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| The "Associative Laws" say: | * It doesn't matter how you group the numbers when you add. * It doesn't matter how you group the numbers when you multiply. (In other words it doesn't matter which you calculate first.) | Example addition: (6 + 3) + 4 = 6 + (3 + 4)
Because 9 + 4 = 6 + 7 = 13
Example multiplication: (2 × 4) × 3 = 2 × (4 × 3)
8 × 3 = 2 × 12 = 24
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| Compatible numbers | are numbers that are easy to compute mentally. They are particularly useful for estimating products and quotients. | Estimate 151 ÷ 146
151 ≈ 150, 14.6 ≈ 15
150 ÷ 15 = 10
151 ÷ 14.6 ≈ 10
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| Expanded Form | is a sum that shows the place and value of each digit of a number. | 0.75 = 0.7 + 0.05
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| Expression | is a mathematical phrase that contains numbers and operation symbols. | 18+11×6
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| Front-end estimation | First adding the "front-end" digits. Then you estimate the sum of the remaining digits. You adjust the sum of the front-end digits if necessary. | Estimate $3.09 + $2.99
$3.09 $ .09
+$2.99 $ .99
$5 about $1
So $3.09 + $2.99 ≈ 5 + 1, or $6
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| Order of operations | Parenthesis Exponents Multiplication Division Addition Subtraction | 23(7-4) =
23 3 =
8 3 =
= 24
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| Commutative Property of Addition | Changing the order of the addends does not change the sum. | 9+5 = 5+9
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| Identity Property of Addition | The sum of 0 and any number is that number. | 0+9=9
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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Created by:
OCA McBrown
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