Adding two logarithms multiplies their numbers. These free printable worksheets take that one law on its own, and every question asks for a sum to be written as a single logarithm.
If they get stuck
The answer key prints on a separate page.
The law is a fact about exponents wearing other clothes. Multiplying two powers of the same base adds their exponents, and a logarithm is an exponent, so adding logarithms has to multiply the numbers underneath. Saying that once is worth more than memorizing the line, because it also explains why the bases have to match.
The mixed sheet is where a student learns to choose between the three laws. This one comes first, for a student who still needs to see the law work a few times in a row. Each answer is a single logarithm, so the marking is a quick glance and any slip stands out.
log₅ 2 + log₅ 8