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# 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

### Algebra

 An introduction to negative numbers. Introduction to negative numbers. How do you add and subtract negative numbers. Giving examples using temperature and the number line. Examples shown: 3 - 4, 2 - 8, -4 - 2, -3 + 2, -1 -2. Ordering negative numbers. Ordering negative numbers from least to greatest, -25, -30, -7, -10, -40.

### Number

 Multiple digit addition - larger numbers Multiple digit addition - larger numbers Adding a four digit number to a four digit number eg. 1235 + 1172. Adding a seven digit number to a seven digit number eg. 1,235,015 + 1,172,090. Adding an eight digit number to a seven digit number eg. 12,235,015 + 1,172,090 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. Adding two decimal numbers Adding two decimal numbers together eg. 0.0085 + 1.799, 5875 + .028, 102.1 + 2.56. This introduces the concept of alignment of the decimal points. Subtracting two decimal numbers Subtracting two decimal numbers from one another. The concept of alignment of the decimal place is covered along with borrowing or renaming. Examples used are the following: 5.73 - 0.0821, 8.25 - 0.0105, 2.64 - 0.00486. 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. Multiplying multiple digit numbers 1 Multiplying a 2 digit and 3 digit numbers by 2 digit and 3 digit numbers eg. 32 x 18, 99 x 88, 53 x 78, 796 x 58, 523 x 798. Multiplying multiple digit numbers 2 Multiplying a 3 digit and 3 digit numbers by 2 digit and 3 digit numbers eg. 235 x 47, 873 x 98, 234 x 643. Introduction to lattice multiplication Explain lattice multiplication and how it works along with two examples: 27 x 48, 5479 x 787. Please note that lattice multiplication is not a methodology taught in Irish Primary schools but we thought we would include it to show that there are other ways to multiply numbers together Explanation of why lattice multiplication work Explanation of why lattice multiplication works. Two examples: 27 x 48, 5479 x 787. Please note that lattice multiplication is not a methodology taught in Irish Primary schools but we thought we would include it to show that there are other ways to multiply numbers together. 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. Dividing a two digit number into a larger number Long division approach to division with and without remainders. Dividing a 4 digit number by 2 digit number eg. 6250 divided by 25, 2265 divided by 15, 5578 divided by 67. Expressing fractions as decimals. Expressing decimals as fractions. Expressing fractions (proper and improper) as decimals. Expressing decimals as fractions. Expressing percentages as decimals & decimals as percentages. Expressing percentages as decimals. Expressing decimals as percentages. Converting percentages and fractions to decimals to order numbers Converting percentages and fractions to decimals to order numbers. Introduction to the concept of equivalent fractions Introduction to the concept of equivalent fractions. Expressing mixed numbers as improper fractions & fractions as mixed numbers Expressing mixed numbers as improper fractions. Expressing improper fractions as mixed number. 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. Calculating time differences across different time zones Calculating time differences across different time zones eg. What is the time difference between 1.25pm and 3.25pm. Using the time line approach and the subtraction approach for both 12hr and 24hr clocks. Defining and identifying Prime Numbers Defining and identifying Prime Numbers. 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. Partial quotient division: An alternate to traditional long division. This video shows the long division method for division as well as an alternative method for dividing called Partial quotient method. The example shown for both is: 1,388 divided by 16.

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