Finding two numbers that add to 3 and multiply to 10 seems an impossible challenge. If the product of the two numbers is positive, they must have the same sign, and since their sum is positive, this means they must both be positive. But if two positive numbers add up to 3, they ...
Round the number n to p decimal places by first shifting the decimal point in n by p places. To do that, multiply n by 10ᵖ (10 raised to the p power) to get a new number, m. Then look at the digit d in the first decimal place of m. If d is less than 5, round m ...
亲和数（Amicable numbers），又称相亲数、友爱数、友好数，指两个正整数中，彼此的全部正约数之和（本身除外）与另一方相等。毕达哥拉斯曾说：“朋友是你灵魂的倩影，要像220与284一样亲密。”市面上你可能还可以买到由两片分别刻有“220”和“284”的半边心形拼成的钥匙串或者首饰。人们购买它们，...
Suppose you want to multiply a column of numbers by the same number in another cell. The trick to multiplying a column of numbers by one number is adding $ symbols to that number's cell address in the formula before copying the formula. In our example table below, ...
For example, if you type=5*10in a cell, the cell displays the result,50. Multiply a column of numbers by a constant number Suppose you want to multiply each cell in a column of seven numbers by a number that is contained in another cell. In this example, the number you want to mul...
This is the proper format for a mixed number to then be multiplied to other numbers. A whole number or other mixed numbers must also be put into fraction format so that the following formula can be used to multiply the fractions: {eq}\frac{a}{b} * \frac{c}{d} = \frac{ac}{bd}...
Example 1: Multiply {eq}(2-3i)(1+5i) {/eq}. Solution: $$\begin{matrix} (2-3i)(1+5i) \\ 2(1+5i)-3i(1+5i) & Distributive\; Property \\ 2+10i-3i-15i^2 & Multiply \\ 2+7i-15i^2 & Combine\;Like\;Terms \\ 2+7i-15(-1) & i^2=-1 \\ 17+7i & Multiply\;an...
15.A modern electronic calculator 16.add, subtract, multiply and divide 17.square roots 18.In a flash 19.in your whole lifetime 20.a living computer 21. more powerful 22.an amazing brain 23.were given this problem to solve 24.took fifty seconds to find the answer 25.had to...
I already mentioned how 4 and 9 are considered to be unlucky numbers. Because they sound the same as “death” and “suffering,” you’ll notice throughout Japan that those numbers are missing. There may not be a 4th floor of a building, or room number 49. ...
if we add zero to a number or multiply by 1, the number will remain unchanged. a+0=a a.1 =a example: 5+0 = 5 and 5 x 1 = 5 additive inverse: if a number is added to its own negative number, then the result is zero. a+(-a) = 0 example: 3+(-3) = 3-3 = 0 ...