Less familiar multiplication targets in Year 5 The National Curriculum targets for multiplication in Year 5 are lengthy and challenging. Obviously, there are targets on mental and written multiplication, such as multiplying numbers up to 4-digits by a 2-digit number, but there are also some less familiar targets which I would like to look at today. These include: 5C5a identifying multiples of numbers. A multiple is found by multiplying a number by an integer (whole number). 15 is a multiple of 5 because 5 x 3 = 15. 5C5a identifying factors and finding all factor pairs of a number. Factors are numbers that multiply together to give other numbers. e.g. 2 and 7 are factors of 14 because 2 x 7 = 14. 5C5a finding the common factors of two numbers. A common factor is a number that can be divided into two or more numbers without leaving a remainder. A typical question might be, ‘What are the common factors of 20 and 25?’ The factors of 20 are 1, 2, 4, 5, 10 and 20. The factors of 25 are 1, 5 and 25. So the common factors of 20 and 25 are 1 and 5. 5C5b knowing and using the vocabulary of prime numbers A prime number is a number that is only divisible by itself and 1. The first few prime numbers are: 2, 3, 5, 7, 11, 13, 17 and 19. Children will be expected to recall all prime numbers up to 19. We have plenty of practice for all these targets plus a wealth of mental and written practice. Why not take a look now at Year 5 Multiplication? Go to Year 5: Multiplication