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Decimals and Decimal Computations. 10 x 10 Model Square is seen as a whole. How many squares make up the whole? How many squares are in a half? How many.

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Presentation on theme: "Decimals and Decimal Computations. 10 x 10 Model Square is seen as a whole. How many squares make up the whole? How many squares are in a half? How many."— Presentation transcript:

1 Decimals and Decimal Computations

2 10 x 10 Model Square is seen as a whole. How many squares make up the whole? How many squares are in a half? How many squares are in a quarter?

3 Fraction -Decimal Connection Cover up 35/100 of the square What is another way to record this part of the whole? What is another way to write 1.68?

4 Familiar Fractions 1/4 = what as a decimal? 1/5 = What as a decimal? 1/20 = what as a decimal? 1/8 = what as a decimal? What strategy do we use to solve?

5 Not so Familiar? 1/3 = what as a decimal? 1/6 = what as a decimal? What strategy do we use now?

6 Estimation = Benchmarking Which Fraction would be the approximate of.52 1/50 1/5 1/4 1/2

7 Fraction - Decimal Match 2.804, 2.41, 2.6271, 2.211 11/5, 2 7/8, 2 5/8, 2 1/3

8 Comparing Decimals/Fractions Estimate using a number line with benchmarks 0, 1/2, and 1 3/8, 2.567, 5/3, 1 4/5, 1.8765

9 Computations With Decimals What comes to mind when you see these computations? 4.907 + 123.01 + 56.1234 459.8 + 12.345 24.67 + 1.84 514.67 / 3.59

10 Estimation First 73.46 + 6.2 + 0.582 Estimate first What is the answer? How can you add and subtract decimal numbers that will work every time?

11 Multiplication What is 24 x 63 So what is.24 x 6.3 24 x.63 2.4 x 63

12 Division 146 / 7 = 20857 (without the decimal point) So what is the answer: 146 / 0.7 1.46 / 7 14.6 / 0.7


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