Decimal Quiz 2 Review

Decimal Quiz 2 Review

Rounding, Compare & Order, Decimal Fractions, Powers of 10

Rounding Decimals

• Underline the place value to round to

• Look to the number on the right of the place we are rounding to

• The number on the right decides whether we are adding one to the place value being rounded or leaving it alone

• everything after the place being rounded goes away

Multiple Choice

 $Round\ to\ the\ nearest\ hundredth:\ 23.387$  

• 23.4

• 23.387

• 23.39

• 23.397

Comparing & Ordering Decimals

• Line up the decimal points

• Add zeroes as needed to make the same amount of digits

• Compare whole numbers first

• If whole numbers are the same, then move on to decimal numbers

• Compare or order as directions describe

Multiple Choice

Which is true?

• 34.468 < 34.486

• 34.468 > 34.486

• 34.468 = 34.486

Fill in the Blank

Order from least to greatest: 2.48, 2.45, 5.3, 2.4, 0.24

Decimal Fractions

• Read the number as though you would write it in words

• The decimal number itself will be your numerator (number on top)

• The last name or last decimal place value will be your denominator (number on bottom)

• If there is a whole number it will go to the left side of the fraction on its own

Fill in the Blank

Write as a decimal fraction

 $0.93$  

Fill in the Blank

Write as a decimal fraction or mixed number

 $34.187$  

Powers of 10

• Multiplying by positive powers of 10 means the number gets bigger and I move the decimal to the right (as many times as the exponent or zeros show)

• Dividing by powers of 10 means that the number gets smaller and I move the decimal to the left (as many times as the exponent or zeros show)

Fill in the Blank

 $34.588\times10^4$  

Fill in the Blank

 $4.38\div10^3$  

Fill in the Blank

 $4.58\times10,000$  

Fill in the Blank

 $38.23\div100$