| add |
v. to put one number together with another to find the total [eg: 2 + 2 = 4] - addition n. |
| After you've added all the numbers in the column, write the total underneath. |
| arithmetic |
n. the study of numbers and how to use them, especially for calculating [eg: adding, subtracting, multiplying, dividing] |
| Kelly doesn't need a calculator to do basic arithmetic. She does it in her head. |
| billion |
n. 1,000,000,000; one thousand million; 109 |
| The only countries with over a billion people in 2019 were India and China. |
| divide |
v. 2 ÷ 2 [is expressed as] two divided by two - division n. |
| What do you get if you divide thirty by five? |
| equal |
v. to be the same as [eg: 2 + 2 equals 4] |
| What does 144 divided by 12 equal? |
| giga- |
prefix meaning one billion [eg: one gigabyte = 1 billion bytes] |
| We used to measure data in kilobytes and megabytes, but now it's more often in gigabytes and terabytes. |
| hundred |
n. 100; 102 |
| Our family has lived on this land for hundreds of years. |
| kilo- |
prefix meaning one thousand [eg: one kilogram = 1 thousand grams] - k, K abbr. |
| Did you know that one kilometre equals around point six two of a mile? |
| mega- |
prefix meaning one million [eg: one megawatt = 1 million watts] - M abbr. |
| Radio station 88.5 FM broadcasts at a frequency of 88.5 megahertz (MHz), or 88,500,000 cycles per second. |
| million |
n. 1,000,000; one thousand thousand; 106 |
| If you won a million dollars, what would you do with it? |
| minus |
prep. 5 - 3 [is expressed as] five minus three |
| Five minus three equals two, but three minus five equals minus two. |
| multiply |
v. 2 x 2 [is expressed as] two multiplied by two - multiplication n. |
| Can you multiply fifteen by sixteen without using a calculator? |
| plus |
prep. 2 + 2 [is expressed as] two plus two |
| Fifty-two plus nine is sixty-one, isn't it? |
| square |
v. to multiply a number by the same number [eg: 3 squared = 9, or 32 = 9] |
| If a square with sides that are 12 metres long covers an area of 144 square metres, 12 squared must be 144. |
| square root |
n. a number that, when multiplied by itself, gives a certain number [eg: the square root of 9 is 3, or √9 = 3] |
| Do you know what the square root of sixteen is? |
| subtract |
v. to deduct one number from another [eg: 12 minus 3] - subtraction n. |
| To calculate a business's profit, subtract costs and expenses from income. |
| thousand |
n. 1,000; 103 |
| If we divide a thousand dollars five ways, we get two hundred dollars each, right? |
| times |
prep. 2 x 2 [is expressed as] two times two - see multiply |
| I know that 7 times 8 equals 56 because we recited multiplication tables at school until we knew them by heart. |
| to the power of |
multiplication of a number by itself [eg: 2 to the power of 3 (or 2 x 2 x 2) = 8] |
| In arithmetic, "two to the power of three" is written as 23. |
| trillion |
n. 1,000,000,000,000; a million million; 1012 |
| Six trillion is a 13-figure number consisting of the number six plus twelve zeroes. |
| zero |
n. 0; oh; nought; nothing |
| A number isn't changed by adding or subtracting zero to or from it. |