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.

E1: Sum puzzle

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.

E2: Product puzzle 1

Complete this multiplication table. Positive and negative numbers are used.

E3: Multiplication table 1
E4: Multiplication table 2 more difficult

E5: Missing numbers: Answer questions such as -12 + = -19

Complete the magic squares

E6: 3 x 3 magic square
E7: 4 x 4 magic square

E8: Multiply by 10, 100 or 1000 eg 0.6 x = 60
E9: Divide by 10, 100 or 1000.

E10: Multiply and divide by 0.1 and 0.01 eg 0.6 x = 0.06
E11: Just multiply
E12: Just divide

E13: Multiply and divide by an integer power of 10 eg 6.6 x = 0.0066
E14: Just multiply
E15: Just divide

I think of a number, add 3.7, then multiply by 5. The answer is 22.5. What is the number?
E16: Using whole numbers
E17: Using numbers to one decimal place

A function machine changes the number n to the number 3n + 1.
What does it do to these numbers? 2, 5, 9, 21, 0
What numbers must be input to get these numbers? 10, 37, 100
E18: Function machine

E19: Mixed operations
eg Find the value of 3 + 6 x 5 + 2. Put in brackets to make the value 45, ie 3 + 6 x (5 + 2) = 45
Use these buttons to generate one problem or a set of 10 problems.