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## Maths Videos

Maths Help Videos

The Maths help videos are displayed categorized by Primary Grade and then by mathematical Strand. Where videos content exceeds the skills appropriate to a grade, the video will be associated to all relevant grades.

We would like to thank Khan Academy for sharing it's mathematical related videos on 4to12maths.com Note: All Khan Academy content available for free at www.khanacademy.org

Multiple digit addition | Quick review of adding two individual numbers eg. 7 + 8. Adding two digit numbers to a single digit eg. 24 + 8. Adding two digit numbers to a two digit number eg. 28 +35. Adding a four digit number to a three digit number eg. 2015 + 143. |

Introduction to borrowing or regrouping | Subtracting a single digit number from a two digit number eg. 17 - 9. Concepts of Units, Tens and Hundreds. Concept of borrowing and regrouping for subtracting the following digit numbers from one another eg. 22 - 17, 703 - 67, 953 - 754. |

Different ways of subtracting | Subtracting a four digit number from a four digit number eg. 9456 - 7589. Showing two method from subtracting one number from another, one is a mental approach another is the borrowing and regrouping approach. |

Subtracting multi-digit numbers involving borrowing | Subtracting multi-digit number involving Borrowing and Regrouping eg. 33,220 - 399, 25,633 - 578, 37,002 - 155, 3,210 - 502. |

Explanation of why borrowing / regrouping works when subtracting numbers | Explanation of why borrowing / regrouping works when subtracting numbers. This shows an explanation of subtracting multi-digit numbers using their expanded forms. Examples shown are the subtracting multi-digit number eg. 1,005 - 616, 732 - 23, 512 - 38. |

Introduction to the multiplication tables : 1 to 9 | Multiplication tables from 1 to 9. |

Introduction to the multiplication tables : 10 to 12 | Multiplication tables from 10 to 12 |

Multiplying a 2 digit number by a 1 digit number | Multiplying a 2 digit number by a 1 digit number eg. 16 x 9, 55 x 8, 78 x 7, 89 x 3, 239 x 6. Explanation of how it works using expanded numbers. It also shows how to multiply a 3 digit number times a 1 digit number and a 4 digit number times a 1 digit number. |

Multiplying a 2 digit number by a 2 digit number | Multiplying a 2 digit number by a 2 digit number eg. 36 x 23, 77 x 77. This video starts with a 4 digit number being multiplied by a 1 digit number as a refresher for the student. |

Introduction to division | An introduction to division. Dividing 1 digit number by another 1 digit number. Dividing a 2 digit number by a single digit number. Introduces us to the concept of the remainder and basic long division. |

Dividing into larger numbers. Introduction to long division and remainders | Long division approach including remainders. Dividing a 2 digit number by 1 digit number. Dividing a 3 digit number by a single digit number. |

Dividing into larger numbers | Long division approach to division with and without remainders. Dividing a 4 digit number by 1 digit number eg. 2292 divided by 2, 6475 divided by 7. Dividing a 7 digit number by a single digit number eg. 1,735,092 divided by 3. |

Expressing fractions as decimals. Expressing decimals as fractions. | Expressing fractions (proper and improper) as decimals. Expressing decimals as fractions. |

How much time between two times | How much time between two times eg. 1.25pm and 3.16pm, 9.16am and 10.17pm. Using the timeline approach and 24hr clock approach. |

Rounding Whole Numbers to the nearest hundred. | Round 24,259 to the nearest hundred. Introduces us to the concept of "Rounding Up" and "Rounding Down" of a number. Visualising the problem on the number line. |

Place Value 3 : Write a number in expanded form. | Write 14,897 in expanded form. |

Rounding Whole Numbers to the nearest thousand. | Round 423,275 to the nearest thousand. Introduces us to the concept of "Rounding Up" and "Rounding Down" of a number. Visualising the problem on the number line. |

Rounding Whole Numbers to the nearest ten | Round 1,585 to the nearest ten. Introduces us to the concept of "Rounding Up" and "Rounding Down" of a number. |

Subtraction: Word Problems | Example Question: A farmer grows 531 tomatoes and is able to sell 176 of them in three days. Given that his supply of tomatoes decreases by 176, how many tomatoes does he have remaining at the end of the three days? |