When you need to multiply decimal numbers by a multiple of 10 (e.g. 10, 100 and 1 000), do not just “move the comma”. First you have to understand what you are doing. E.g. 1,12 x 100. You can write 1,12 as 112 hundredths (as a common fraction) and when you multiply 112/100 by 100, the…
When you do division of decimal numbers with natural numbers, follow the long division method. Just keep track of when you are “crossing” the decimal symbol. Remember that you should not have a remainder when dividing decimal numbers with natural numbers, as the place values on the right-hand side of the comma already indicate remainders….
An easy way in which you can add or subtract decimal numbers, is the column method. For the column method, you need to write the decimal symbol of each number under each other and the correct digits under the corresponding place values. Then, add or subtract from the right-hand side to the left-hand side to…
What is the difference between decimal fractions and decimal numbers? A decimal fraction refers to a decimal number in base 10. In South Africa we use a comma as the decimal symbol. The place values on the right-hand side of the comma will be tenths (t), hundredths (h), thousandths (th) and so on. What is…
When you watch this video, you will see that integers can be thought of moving up and down in an elevator/lift. When moving up, the sign will be positive and when moving down, the sign will be negative. Once you rotate the lift example 90 degrees clockwise, you will end up with a number line…
How do you determine an item’s price if there is a percentage increase or decrease? In other words, what should you pay if there is a discount or if there is an increase in the price? To determine the new amount, we can make use of two methods. In the example of the price of…
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