It's a very fishy time as we look at multiples and products, suitable for year 4 upwards, for children who are gaining a good knowledge of times tables. To know whether a number is a multiple of 3 for example, it is very useful to know the rules of divisibility, as this avoids having to carry out the complete calculation. Briefly some of the main tips for knowing whether a whole number is a multiple of another number are: a. a number is a multiple of 2 if the last digit is even eg 13456 b.  A number is a multiple of 3 if the sum total of the digits is divisible by 3 eg 252 is a multiple of 3 because 2 + 5 + 2 = 9 which is divisible by 3 c. A number is a multiple of 4 if the last two digits are divisible by 4 eg 740 is a multiple of 4 because 40 is divisible by 4 d. A number is a multiple of 5 if the last digit is 0 or 5. eg 345 is a multiple of 5. e. A number is a multiple of 6 if it is even and a multiple of 3 eg 252 is also a multiple of 6 f. a number is a multiple of 9 if the sum of the digits is divisible by 9 eg 567 is a multiple of 9 because 5 + 6 + 7 = 18 (also 1 + 8 = 9) g. a number is a multiple of 10 if the last digit is a zero. (There is no easy way to find whether a number is a multiple of 7.) Most of the questions on these pages are pretty obvious but it would help to know these rules of divisibility. The last part of the worksheet is a quick reminder that finding the product of two numbers is a multiplication calculation, not an addition sum.