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Number and Operations. To write decimals as fractions, you must understand place-value!

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Presentation on theme: "Number and Operations. To write decimals as fractions, you must understand place-value!"— Presentation transcript:

1 Number and Operations

2 To write decimals as fractions, you must understand place-value!

3 Whole numbers are found to the left of the decimal point. The parts of a whole are found to the right of the decimal point. Numbers that end here have a denominator of 10 Numbers that end here have a denominator of 100 Numbers that end here have a denominator of 1,000

4 3.25 3 wholes and 25/100 3 1/4 Simplified!

5 26.82 26 wholes and 82/100 26 41/50 Simplified!

6 125.54 125 wholes and 54/100 125 27/50 Simplified!

7 To write fractions as decimals, try to scale your fractions so the denominator is 10, 100, 1,000 or 10,000!

8 Scaled up to 10!

9 Scaled down to 4 and then up to 100! You can simplify before you multiply!

10 Remember, you can always divide to convert a fraction to a decimal!

11 Per ---- cent Means “Out of ---- 100” If you can scale up to a denominator of 100, your numerator is a percent!

12 Put dimes in the numerator and total coins in the denominator 6 20 Multiply the numerator and the denominator by 5 30 or 30% 100

13 Sometimes fractions can not be scaled to have a denominator of 100. What should you do?

14 Then, simply multiply the decimal answer by 100! 0.375 = 37.5%

15 Hint 1: The percent sign looks like a division sign, so you must divide. Hint 2: The percent sign looks like a 100. You must remove the association with 100 through division!

16 Hint: Since percent means “out of 100” and you do not see the percent sign, you must multiply by 100 to add the percent sign!

17

18 Convert all numbers to the same form. When you compare or order numbers: Make sure you pay attention to the order requested:  Least to Greatest  Greatest to Least Use whole numbers before the parts of the whole as you place them in order!

19 A The subtotal is $45.11

20 I

21 1.25

22 B

23 H

24 B

25 F

26 15%

27 C

28 H

29 B

30 1/25

31 I

32 Numbers and Operations Keep Practicing!


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