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; 10^{9} |
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; 10^{2} |
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; 10^{6} |
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 3^{2} = 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; 10^{3} |
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 2^{3}. |
trillion |
n. 1,000,000,000,000; a million million; 10^{12} |
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. |