Make 24

(10 x 10 - 4)/4

Make 24

8 5 4 10 = 24

(8+4)x (10/5)

2 8 5 5

(5/5+2)x8

6 6 8 4

(6+6)x (8/4)

1 3 10 4

(3-1)x (10+4)

13 8 2 6

13 x (8-6) - 2

10 3 8 9

8 x 3 x 10 -9

Puzzle of the Week

123 -45-67+89=100

Hmmm A Few More Puzzles

1. The last person took the basket with the egg in it.

2. All the others were women

3. Pour the juice from the 2nd glass to the 5th

4. The recluse lived in a lighthouse

Puzzle

He needs to take 1 bolt from crate 1
2 bolts from crate 2
3 bolts from crate 3
4 bolts from crate 4
5 bolts from crate 5
and weigh them altogether.
If he gets 5 g overweight he knows it is crate 5 etc

Puzzle Year 6 Year 7

19/95 25/65 16/64

Can all be reduced by cancelling the number that is common in the denominator and numerator

Make 24

4 7 8 8

(7 - 8/8) X 4

There were many answers to this one!

Year 6 Puzzle

Start with a 6 digit number that begins with 1. Move the 1 from the hundred thousands place to the digits place. The number is now 3 times bigger than the original number. (The other digits stay exactly the same)


The first number can be expressed as
100 000 +x
The second number can be expressed as
10x +1

3(100 000 + x) = 10x +1
300 000 + 3x = 10x + 1
299 999 = 7x
42857

142857

Puzzle

Mr Golan asked the class to see if they could find the sum of the first 50 odd numbers. As everyone settled down to their addition, Julia ran to him and said, "The sum is 2,500." Mr Golan thought, "Lucky guess," and gave him the task of finding the sum of the first 75 odd numbers. Within 20 seconds, Julia was back with the correct answer of 5,625.
How did she do this?

Actually all you have to do is square the number of odd numbers you want added ie

The sum of the first 50 odd numbers is 50^2 (50 squared)

The sum of the first 75 odd numbers is 75^2 (75 squared)