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 transcript:

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 squares are in a quarter?

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?

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?

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

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

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

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

Computations With Decimals What comes to mind when you see these computations? / 3.59

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

Multiplication What is 24 x 63 So what is.24 x x x 63

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