Number Cruchers
Calculate 12 - 3 x 3 + 6 x 2
15
What has to be broken before you can use it?
An egg
Write 1/5 as a decimal.
0.2
Substitute and find the value of the expressions: 15 - 3x, when x=2
9
What goes up but never comes down?
Age
Round 4728 to the nearest hundred.
4700
9
Simplify 18/24
3/4
Solve 12x=96
x=8
What occurs once in every minute, twice in every moment, but never in a thousand years?
The letter "m"
What is 11.25 divided by 0.5?
22.5
What three numbers give the same result when added or multiplied?
1, 2, 3
Add 3/8 + 5/12
19/24
Find an expression for: "three less than twice a number n"
2n - 3
You need exactly 4 liters of water, but only have a 3 liter jug and a 5 liter jug. The jugs don't have any measurements on them. How do you do it without estimating?
Fill 5l; pour that into 3l; empty 3l; pour the remaining 2l into 3l jug; fill 5l again; pour until 3l is full; exactly 4l left in 5l jug.
Find the HCF (highest common factor) of 24 and 36.
12
A cube has 8 corners. If you cut off one corner, how many corners is there now?
10
Find 15% of 200.
30
Find (x + 4)/6 when x=20
4
You are in a dark room with one match, a candle, a lantern, and a fireplace. Which do you light first?
Calculate 2(8 x 3 - √(82 + 62)) + 32 x 23
100
You planted sunflower seeds in your garden. Every day, the number of flowers doubles. If it takes 52 dats for the flowers to fill the garden, how many days would it take for them to fill half the garden?
51 days
A laptop costs $800 and it is on sale for 15% off. You go to buy it and also use a coupon to get an additional 10% off. What is the final price?
$612
Solve (4h)/11 + 23 = 15
-22
You have 3 switches in one room and 3 light bulbs in another (you can't see the bulbs from the switches). You can only go into the bulb room once. How can you figure out which switch controls which bulb?
Turn on the first switch for a while, then turn it off. Turn on the second switch and leave it on. Enter the bulb room: the bulb that is lit = switch 2; the turned off but warm = switch 1; the turned off and cold = switch 3.