Addition and Subtraction

Consider $33$33 and $27$27.

a

What is the highest common factor of these two numbers?

b

Complete the gaps such that $33+27$33+27 is rewritten as an equivalent multiplication using the distributive property.

$33+27$33+27 | $=$= | $3\times\left(\editable{}+9\right)$3×(+9) |

$=$= | $\editable{}\times20$×20 |

Easy

Approx 2 minutes

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Generalise the properties of addition and subtraction with whole numbers