SFAW Mathematics Chapter 1  Key Vocabulary and Concept Review  Page 50  
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Chapter 1 Key Vocabulary and Concept Review
Self Check
 Numbers can be written different ways. (Lessons 1-1, 1-2, 1-3, 1-4, 1-5)
 The number 897,264,770.684 is written in standard form.
 Write it in word form and in expanded form.
 Describe the value of  each digit in words.  Separate each period  with a comma.
 eight hundred  ninety- seven million, two  hundred sixty-four  thousand, seven hundred  seventy and six hundred  eighty-four thousandths.
 Use place value to  expand.
Number System
 800,000,000 + 90,000,000 + 7,000,000 + 200,000 + 60,000 + 4,000 + 700 + 70 +
 0.6 + 0.08 +  0.004
   1.  Write the value of the underlined digit in 58,741 and 638,850,247.
When you expand a telescope, you make it longer. The expanded form of a number makes it longer by writing a number as a sum of the place values as its digits.(p. 4)
Self Check When you expand a telescope, you make it longer. The expanded form of a number makes it longer by writing a number as a sum of the place values as its digits.(p. 4)
 Pay attention to place value when adding or subtracting  numbers. (Lesson 1-11, 1-12, 1-13, 1-14) When you expand a telescope, you make it longer. The expanded form of a number makes it longer by writing a number as a sum of the place values as its digits.(p. 4)
 Find 85,247.3 + 788.05.
 Line up the decimal points.
Find 5.4 – 1.25.
Line up the decimal points.
Find 85,247.3 plus 788.05
Add. Be sure to place the decimal point in the sum.
Find 5.4 minus 1.25 Rewrite using equivalent
decimals.
Regroup as
necessary to subtract.
   2.  Add or subtract to find 57,454 – 6,735.6 and 159,624 + 598,384.
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