Tell them to think of a number between 1-9. Tell them to double it Tell them to add, let's say, 4 Tell them to half it Tell them to tell them their answer and their answers would be 2. How? Easy. Half of the number you tell them to add after they double their, is the number they started with. In this case, 2 would be their starting answer because half of 4 is 2 It also works with odd numbers, if you're good at calculating decimals So remember. Think of a number. Double it Add a number of your choice Half it Ask for their answer. Half the number you told them to add Tell them And there you go, they'll think you're a mind-reader
22 Double it, add two, double it, add two, etc.
It's not possible to double any whole number, then add 4, and wind up with an odd number.
That always gives you an odd number.
It means to multiply the number by 2 or to add it to itself. So if the original number is 10, then double that number would be 20.
add numbers below to each number at the top
the number was 340
2x + 20
Double it. Add or subtract one. Multiply it by an even number. Threaten it.
To double in math, it means to take a number..... such a 2 and take that number and add it 2 times here are some examples EX: 2 double 2 = 4 EX: 3 double 3 = 6 So the point of doubling is you add the same number.
addition i think
The trick is that you ask somebody to think of a number, double it, add 10, half it , take away the first number you thought of and your answer is 5 . This is because you asked them to add 10 and their answer was 5. it is just the same with other numbers as long as they are even. Say if you asked them to add 8, their answer would be 4 or if you asked them to add 6, their answer would be 3. You just half the number that you added and it will instantly get you their answer.
You double the number before it and add 1.
5 I think add me ahillster
Start with n, then you get; Add 17: n + 17 Double it: 2n + 34 Subtract 4: 2n + 30 Double it: 4n + 60 Add 20: 4n + 80 Divide by 4: n + 20 Subtract 20: n which is where you started.
Yes. Adding eight to any number and then subtracting that number will leave the eight.
Always an even number. Think of an odd number as an even number plus a half. Add them up and the two halves make an even.
Think about how hard it was with the first....then add about double that with the next.
I think of a number then subtract 3.75 from it.I add 2 times 6.25;then I add 25 to the obtained result and the final number will be 100.What was my initial number?
To arrive at the number of hydrogen atoms, double the number of carbon atoms, then add two.
The names of numbers from 1 to 100, in English, are:onetwothreefourfivesixseveneightnineteneleventwelvethirteenfourteenfifteensixteenseventeeneighteennineteentwentytwenty-onetwenty-twotwenty-threetwenty-fourtwenty-fivetwenty-sixtwenty-seventwenty-eighttwenty-ninethirtyFor 31 to 39, add a hyphen - after "thirty" and add the single number (same as above for 21 to 29.40. FortyFor 41 to 49, again add a hyphen - then add the single number.50. FiftyFor 51 to 59, again add a hyphen - then add the single number.60. SixtyFor 61 to 69, again add a hyphen - then add the single number.70. SeventyFor 71 to 79, again add a hyphen - then add the single number.80. EightyFor 81 to 89, again add a hyphen - then add the single number.90. NinetyFor 91 to 99, again add a hyphen - then add the single number.100. One hundredFor all 3-digit numbers in English, start with the "hundredths" and add the double-digit number, for example:398 would be three hundred ninety-eight. (ninety-eight is a double-digit number)
15 or any whole number you can think of multiplied by nine and then add 6
Adding the same number twice l like 75+75=150