Solve problems involving multiplying and adding, including using the distributive law to multiply two digit numbers by one digit, integer scaling problems and harder correspondence problems such as n

What this means, in plain words

The distributive law lets you split a multiplication into easier parts, so 7 times 13 becomes 7 times 10 plus 7 times 3.

A digit is one of the ten symbols, 0 to 9, that all numbers are written with.

An integer is a whole number, with no fraction or decimal part.