**"Inverse operations"**

## MD Puzzle

*By toni On 8 January, 2021 · Leave a Comment*

What do you notice about the numbers in this square?

Write numbers in the blank boxes in squares B, C. and D that make the same patterns as in square A.

Cards 1 to 16 all use multiplication or division and give clues about the numbers in squares A, B, C […]

## Digit Detective

*By toni On 27 July, 2020 · Leave a Comment*

You are a detective and you have to discover what digits the question marks stand for. They can be any digit from 0 to 9 and they can be the same digit or different digits.

How will you find the missing digits?

What do you notice?

How many solutions are there to the calculations?

What clues […]

## Checkit Game

*By toni On 29 May, 2020 · Leave a Comment*

The Checkit Game is suitable for all ages because you can choose the type of numbers and the operation that you will use.

You can play this game with (1) addition and subtraction or with (2) multiplication and division, whichever you choose.

The numbers on the edges of the triangle are the […]

## Checkit Challenge

*By toni On 28 May, 2020 · Leave a Comment*

The numbers in the boxes are the sums of the numbers at the vertices.

Find the numbers to replace the question marks and check your answers by subtracting to check additions and adding to check subtractions.

Click here to download the CHECKIT worksheet.

Click here for the Notes for […]

## More Magic Numbers

*By toni On 20 February, 2020 · Leave a Comment*

Complete the calculations in the first list. Then use your answers to find the numbers to fill the boxes in the second list.

What do you notice about the connections between the equations: ☐ × 8 + 1 = 9 etc. and the calculations: (9 – 1) ÷ 8 […]

## Function Flow

*By toni On 1 July, 2018 · Leave a Comment*

The input to Function Machine 1 is x. Write down an expression for the output.

If the output is 7 what was the input?

In Function 2, a is constant. If the input is 4 what is the output?

The functions from Function Machines 1 & 2 are combined to give Function […]

## SWAP

*By toni On 21 April, 2018 · Leave a Comment*

(1) You are blindfolded. The audience tells you the number in Box B and you can immediately say the numbers in box C and box A.

How is this trick done?

Can you make the trick more impressive?

You can change the x 6 and + 5 to other operations and numbers […]

## LOWER SECONDARY A3 FUNCTIONS AND INVERSE FUNCTIONS

*By toni On 23 January, 2018 · Leave a Comment*

Number games that develop recognition and understanding of functions and inverse functions and the ability to create formulas.

Click here to download a pdf with all you need to run your own professional development workshop.

## Beautiful Numbers

*By toni On 5 October, 2017 · Leave a Comment*

Work out the different numbers to replace the question marks.

What do you notice about the patterns in these calculations?

Can you explain why this pattern occurs?

## Number Sentences

*By toni On 18 July, 2017 · Leave a Comment*

Put the missing symbol into the box to make these number sentences correct.

Use the symbols +, −, ×, ÷ and =.

17 ☐ 21 = 38

17 ☐ 3 = 51

57 ☐ 29 = 28

9 ☐ 63 ÷ 7

You can make most of the number sentences below correct by putting in […]

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