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# Math chapter 1

### EDM

Question | Answer | Example |
---|---|---|

What is a PRIME NUMBER? | The only factors of a prime number are 1 and itself | The only factors of 13 are 1 and 13. 13 is a prime number. |

What is a COMPOSITE NUMBER? | A composite number has more factors than just 1 and itself. | 8 has more factors than just 1 and itself. For example, 2 is a factor of 8: 8 ÷ 2 = 4 8 is a composite number. |

What are FACTORS? | Factors are the numbers you multiply together to get another number | 3 and 4 are factors of 12, because 3x4=12. Also 2x6=12 so 2 and 6 are also factors of 12, and 1x12=12 so 1 and 12 are factors of 12 as well. So ALL the factors of 12 are 1,2,3,4,6 and 12 |

What does DIVISIBLE mean? | When one number can be divided by another and the result is an exact whole number. | 15 is divisible by 3, because 15 ÷ 3 = 5 exactly 15 is divisible by 3, because 15 ÷ 3 = 5 exactly But 9 is not divisible by 2 because 9 ÷ 2 is 4 with 1 left over. But 9 is not divisible by 2 because 9 ÷ 2 is 4 with 1 left over. |

What is a PRODUCT? | The answer when two or more numbers are multiplied together. | 15 is the product of 3 x 5 3 x 5 = 15 |

What is a SQUARE NUMBER? | A square number is the product of a number multiplied b itself | 9 = 3 x 3 ( 9 is a square number because it is the product of 3 x3.) |

What is an EXPONENT? | The exponent of a number shows you how many times the number is to be used in a multiplication. It is written as a small number to the right and above the base number. | 2 8 = 8 × 8 = 64 |

What is a FACTOR TREE? | A graphical representation showing the factors of a composite number. | 36 6 x 6 3 x 2 3 x 2 |

What is PRIME FACTORIZATION? | A prime factorization shows how to write a number as the product of prime factors. | What are the prime factors of 15? Divide by prime factors until the quotient is 1. 15 ÷ 3 = 5 5 ÷ 5 = 1 The prime factorization of 15 is: 15 = 3 × 5 |

Created by:
gwcs grade 5