 We have the biggest number in the first row and calculate from right to left starting with the units But oh dear. We cannot subtract 8 from 3 Yes, you know it. We just borrow one of the tens The tens are now only 5 but our units are 13 Remember that we took 10 units Okay, our new number is now 13 in the units 13 minus 8 is 5. We now start subtracting the tens and we can subtract 5 from 5 Which leaves 0 We move next to the hundred. We see that again. We cannot subtract 1 from 0 So we go borrow from the thousands The thousands remain now with 4 but the new number in the hundred is now 10 10 minus 1 is 9 We write a comma in front of the hundreds Place value now we subtract the thousands and 4 minus 2 is 2. The difference between the numbers is 4,905 times Viewers and learners it was so nice to have your attention for this lesson Thank you. And from the hard work educational multimedia project. We wish you success in your mathematics studies Before we go who just recap We have seen that there are three main units of mass namely Tons the biggest which is abbreviated at T kilograms is most often used in Day life and it's written shortly as KG and Gramps is the smallest it is written as G each of this unit is a Thousand times heavier than the other before there are 1000 grams in kilogram and 1000 kilograms in one tone Remember that when we compare measurements we must make sure to use the same units This means that sometimes we must convert everything to a smaller unit before we do calculations The four main operation used in master division multiplication addition and subtraction