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Number prompts

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Calculations: multiplication 
im  24 x 21 = 42 x 12 
im  21 x 534 > 21 x 53 x 4 > 2 x 1534

Calculations: addition
im  Pyramid addition inquiry
Calculations with decimals
im  60 x 1.2 = 60 + 12

Calculations: division
im  Division inquiry
Calculations with negative numbers
im  Negative numbers inquiry
Place value and decimals
im  Place value inquiry
Prime numbers
im  Prime factors inquiry
Factors and multiples
im  The product of the factors of 24 equals 244.
im  The product of two numbers divided by their highest common factor is their lowest common multiple.
im  There are four pairs of integers which have a highest common factor of 6 and a lowest common multiple of 180. 
im  The sum of two fractions equals their product.
im  Adding fractions inquiry
im  The sum of two unit fractions is a unit fraction.
im  Fraction of a number inquiry
im  Fractions inequality inquiry
Fractions and decimals
im  Any fraction can be converted to a decimal and any decimal can be converted to a fraction.
im  Recurring decimals inquiry

im  40% of 70 = 70% of 40
im  Percentage increase and decrease inquiry
im  Compound interest of n% per annum for x years is greater than compound interest of x% per annum for n years.
Ratio and proportion
im  Ratio inquiry 

im  Surds inquiry

Indices (exponents)
im  Indices inquiry
im  Squares and cubes inquiry
im  Laws of exponents inquiry
im  Base and index inquiry
im  Inequalities inquiry