**"Inverse operations"**

## Grades 10 to 12 Swop

*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 […]

## Grades 4 to 7 MD

*By toni On 27 January, 2018 · 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 give clues about the numbers in squares A, B, C and D. […]

## 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.

## Grades 4 to 7 Digit Detective

*By toni On 27 October, 2017 · 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 […]

## Grades 6 to 8 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?

## Grades 4 to 7 Checkit

*By toni On 18 July, 2017 · 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.

## Grades 4 to 6 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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