Make 24! *****

Use all of the numbers and any of the four operations (+, -, x, ÷) to make number sentences that equal 24.

Example: 6  2  3  8           Solution: 6 x 3 + 8 -2

A)  5  4  7  3 

B)  11   10   2   6

C)  1   2   6   8

D)  1   3   7   8

E)  2   4   5   6

Helpful hint:  Think about the order of operations BIDMAS.  You can use an operation more than once in each solution.  If you get stuck on one move onto another one and then go back. 

Subtraction Snap *

Purpose:

To practise subtraction and immediate recall of facts.

Players: 2

Equipment:    - deck of cards: Ace to 9 (Ace =1)

Instructions:

• Players divide the cards evenly between themselves.
• Each player turns over one card at the same time. Players must subtract the smaller number from the larger number of the two cards and say their answer out loud.  The first player to say the correct answer collects both cards.
• In the event of a tie, set both cards aside and continue play.  The winner of the next round that doesn’t end in a tie takes all the cards set aside by ties.
• Play continues for a set amount of time or one player loses all their cards.  The player with the most cards is the winner

Variation:

For a three-player game, assign two players as the addition cards.  (Add their card values together.)  The third player’s card will be subtracted from the sum of the other two.

What is the missing number? Solution

Solution:

7	3	4
12	5	7
9	2	7

The missing number is 7.  In each row, the first number minus the second equals the third.

8	5	40
9	2	18
6	4	24

The missing number is 4.  In each row, the first number times the second number equals the third number.

What is the missing number? **

Each puzzle has a missing number.  
Can you work out what it is?  
Try to justify your answer.
 

7	3	4
12	5	7
9	2	?

 

8	5	40
9	2	18
6	?	24

 
Make up your own missing number problems.

10 Pence Solution

There are eleven differrent ways to give somebody 10 pence.

10

5, 5

5, 2, 2, 1

5, 2, 1, 1, 1

5, 1, 1, 1, 1, 1

2, 2, 2, 2, 2

2, 2, 2, 2, 1, 1

2, 2, 2, 1, 1, 1, 1

2, 2, 1, 1, 1, 1, 1, 1

2, 1, 1, 1, 1, 1, 1, 1, 1

1, 1, 1, 1, 1, 1, 1, 1, 1, 1

10 Pence **

How many different ways are there to give someone 10 pence?

Helpful Tips:  Work in an organized way.  Perhaps start with larger value coins and work your way down to the smaller value coins.  Use real coins to help you. 

Number Mazes Solution

13 = 1 + 2 + 2 + 1 + 7

38 = 4 + 9 + 9 + 8 + 8

34 = 10 + 6 + 1 + 2 + 10 + 5