| A | B |
|---|
| cube | a solid figure whose faces are all squares |
| digit | symbol used to write numbers |
| period | a three-digit group of numbers separated from others by a comma |
| standard form example | 72,145 |
| expanded form example | 70,000+2000+100+40+5 |
| written word example | seventy-two thousand, one hundred forty-five |
| exponent | a "flying" number that tells how many times another number is used as a factor |
| number line | a line that shows numbers in order |
| equivalent decimals | decimals that name the same number |
| front-end estimation | a way to estimate a sum by adding the first digit of each addend and adjusting |
| product | answer in multiplication |
| sum | answer in addition |
| difference | answer in subtraction |
| quotient | answer in division |
