In this lesson we're going to learn about decimals in money. The reason why I'm calling this lesson "Decimals in money is because when you're writing the currency (money), you write the cents in tenth and hundredth place.
Also the 4 operations are applying to the decimals because it applies in exactly the same way to money problems that we're dealing everyday.
Before I show you examples, I want to tell you how to write the currencies in numbers.
For example twenty three dollars and thirty seven cents.
$23.37 We write $23 in the whole number column and we write thirty cents in tenths and we just write 3 in there and 7 cents in hundredth.
1. Our first example is $539 + $78.26.
1
$539.00 0 + 6 = 6, we just write 6 under, 0 + 2 = 2 we just write 2 under,
+ $78.26 9 + 8 = 17 we write 7 and write 1 above 3, 3 + 7 = 10 and we add 1
= $617.26 that makes 11, so we write 1 and write another 1 above 5.
Lastly we add 1 to 5 and that makes 6 therefore the answer is $617.26.
2. Second example is 183.74 - 54.26.
$183.74 We can't do 4 - 6 so we borrow 1 from 7 and that makes us 14 - 6 = 8,
- $54.26 7 becomes 6. 6 - 2 = 4, we borrow 1 from 8, 13 - 4 = 9,
8 becomes 7, 7 - 5 = 2, there's nothing do with 1 so we just write 1.
= $129.48
Therefore the answer is $129.48.
3. Third example is $4.73 x 8.
2
$4.73 Firstly, 3 x 8 = 24, we write 4 under 8 and write 2 above 7,
x 8 7 x 8 =56 56 + 2 = 58 we write 8 behind 4, write 5 above the 4.
Lastly, 4 x 8 = 32, 32 + 5 = 37.
$37.84
Therefore our answer is $37.84.
4. Forth and last example is $76.82/2.
38.41
2 76.82 6 is close to 7 and is smaller so 2 x 3 = 6, 7 - 6 = 1,1 comes down so as 6,
6 it makes 16, 2 x 8 = 16, 16 -16 = 0, then 2 x 4 =8 equals to 8, 8 - 8 =0,
16 2 x 1 = 2 therefore we subtract 2 - 2 equals 2
16
8
8
2
2
0
Therefore the answer is $38.41.
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