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## Grades 5 to 7 Spin High or Low

*By toni On 20 January, 2018 · Leave a Comment*

To win this game you need to understand place value and the game can easily be adapted to include decimals. All versions of the game can be played by a whole class as a lesson starter or in pairs.

You will need a 0-9 spinner like the one in the picture or […]

## Grades 4 and 5 Target 100

*By toni On 3 January, 2018 · Leave a Comment*

This is a game for the whole class. It can be played a few times as a lesson starter. The teacher will need a 0 to 9 spinner or dice.

All the learners should draw in their notebooks a hundreds, tens and units grid as shown. The teacher spins the spinner and […]

## Grades 4 to 8 Scissors, Paper, Rock

*By toni On 19 November, 2017 · Leave a Comment*

For scissors hold out 2 fingers like a pair of scissors.

For paper hold your hand out flat.

For rock clench your hand into a fist.

Count 1 , 2, 3 and then both players make one of the signs scissors, or paper or rock at the same […]

## Grades 5 to 10 PIG

*By toni On 19 November, 2017 · Leave a Comment*

Both players start with zero points and take turns to throw the dice as many times as they like adding the total at each throw to their score.

Suppose you throw a double one. On the next throw, is your chance of throwing a double one the same, more likely or less […]

## Grades 10 to 12 Two Aces

*By toni On 3 October, 2017 · Leave a Comment*

We have six cards, four Aces and the Jack of hearts and Queen of spades in an envelope or bag. You pick 2 cards at random and tell me “I have an Ace”. What is the probability that you have two aces?

Next suppose I pick 2 of the 6 cards at […]

## Grades 10 to 12 Epidemic

*By toni On 2 October, 2017 · Leave a Comment*

Twenty per cent of the inhabitants of a city have been inoculated against a certain disease. An epidemic hits the city and the chance of infection amongst those inoculated is 10% but amongst the rest it is 75%.

Copy and fill in the contingency table and the Venn diagram below and use them to answer […]

## Grades 9 to 12 In the Bag

*By toni On 4 August, 2017 · Leave a Comment*

You have 2 different bags of marbles.

One bag has 3 Red and 2 Blue the other has 5 Red and 3 Blue.

Mzo picks one marble from each bag at random.

What is the probability he picks one of each colour? What is the probability he does NOT pick a […]

## Grades 10 to12 If This Then That

*By toni On 4 August, 2017 · Leave a Comment*

In front of you there are 20 envelopes.

Eight of the envelopes each contain 5 blue and 3 red sheets of paper.

The other 12 envelopes each contain 6 blue and 2 red sheets of paper.

You choose one envelope at random. Then you choose a sheet of paper from it at […]

## Grades 6 and 7 Half a Million Game

*By toni On 17 July, 2017 · Leave a Comment*

Which of these numbers is closest to half a million?

This game uses ten cards numbered 0, 1, … 9. The cards are put face down and mixed up. The aim of the game is to make a number as close to half a million as possible.

Each player has six boxes […]

## Grades 8 to 10 At least one

*By toni On 12 November, 2016 · Leave a Comment*

If Busi has 3 children what is the probability that at least one will be a girl?

Imagine tossing a coin three times.

What’s the probability you will get a head on at least one of the tosses?

Suppose you drew this tree diagram. How would it help you to find the answers to […]

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