| Order,
add, subtract, multiply and divide positive and negative numbers |
An example of a wall puzzle |
C1:
Wall puzzles with positive and negative
numbers
The number
on a brick is either the sum, difference or product of the two numbers
below. Drag the numbers on to the wall. When the numbers are in the
right place the polygon characters will spin round. There are 6 levels
of difficulty: level 1, five numbers have to be placed on the wall,
level 6, all ten numbers have to be dragged to the wall.
 Use
these buttons to decide how the numbers are worked out.
The choices are: the sum, the difference or a mixture (product, sum,
difference).
Select
the level with the slider. Click on 'go'.
Click
on the 'change' button to quickly generate a new wall puzzle.
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C17:
Compare positive and negative temperatures on
thermometers
Show
up to three thermometers. Click on the 1, 2 or 3 buttons to generate
one, two or three thermometers. The top thermometer will usually show
the highest temperature. Clock on the blue rectangles
to reveal the temperatures.
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Sum
puzzle
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Another
sum puzzle
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C2:
Sum puzzle
Add and subtract positive and negative numbers. Write a number in
each circle so that the number in each square equals the sum of the
two numbers on either side of it.
C18: Another
sum puzzle
The three
numbers in each line must add up to the same total. The total can
be shown or hidden.
The number options are: 1. Small whole numbers 2. Multiples
of ten 3. Decimals 4 Positive and negative numbers.
Use the other buttons to show a few puzzles or just one.
Multiply
positive and negative numbers. Write a number in each circle so that
the number in each square equals the product of the two numbers on either
side of it.
C3:
Product puzzle 1
C4: Product puzzle 2 numbers
up to 20
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Sum,
Difference and Product
C5:
A problem-solving activity
Two
small numbers are generated, their sum, difference and product are
worked out.
Hide the two numbers, can you work out what they are from their sum,
product and difference?
Click on 'change' to generate two more numbers.
Hide the product, work out the two numbers from their sum and difference.
Hide the
odd or even labels: is it possible to say whether a sum, product or
difference will be odd or even?
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Complete
this multiplication table. Positive and negative numbers are used.
C6:
Multiplication table 1
C7: Multiplication table 2
(more difficult)
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C8:
Missing numbers: Answer questions
such as -12 + 
= -19
Complete
the magic squares
C9:
3 x 3 magic square
C10: 4 x 4 magic square
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Number
cell puzzles: the empty cells are filled by adding the two preceding
numbers. Click in a cell to reveal or hide the number.
C11:
Number cell puzzles 1 (first
two numbers revealed)
C12: Number cell puzzles
2 (last two numbers revealed)
C13: Number cell puzzles
3 (first and last or third and last numbers revealed)
C14: Number cell puzzles
4 (all numbers hidden, decide yourself which numbers
to reveal)
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