Transcript Intro Unit

Math Review #1
MATH 8
Place Value

85 629 325


The value of this # is not 6. It is 600 000 (six hundred thousand
What is the value of 529 326
Value is 9000 (nine thousand)
Standard, Expanded & Written Form

Standard:
359261
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Expanded:
300 000 + 50 000 + 9 000 + 200 + 60 + 1

Written:
three hundred fifty-nine thousand two hundred sixty-one

Write 233 432 in expanded and written forms

Expanded: 200 000 + 20 000 + 3000 + 400 + 30 + 2
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Written: two hundred twenty-three thousand four hundred thirty-two
Rounding
ones
hundreds
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4 2 9.6 2 5
tens

hundredths
tenths
thousandths
Round 3.9264 to the nearest hundredth
 3.9264

6 is bigger than 5 so round up
 3.93
Don’t
put any numbers after the hundredth position
Rounding

Round 5.65394 to the nearest hundredth
 5.65394

3 is smaller than 5 so stays the same
5.65
Round 18.42859 to the nearest thousandth
 18.42859
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

5 is same as 5 so round up
18.429
Round 5.99526 to the nearest hundredth
 5.99526
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

5 is same as 5 so round up, 9 goes to zero so carry over the rounding
 6.00
 Keep
“0” because we need to show we rounded to the nearest
hundredth
Number Line
-4 -3 -2 -1 0
A
M
1
H
T

Put the following #s on the number line

H: 1
1
2
M: -2
1
2
T:
2
1
2
A: -
1
2
3 4
Arrows
means it
goes
forever in
both
directions
“infinite”
Addition & Subtraction

Add 4.92 & 3.55

6.85
+ 3.91
Line up the number in columns
4.92
10.76
+3.55
8.47

Subtract 2.96 from 5.33
42
1
1
5.33
4.82
- 3.95
0.87
- 2.96
2.37
6.05
- 3.08
Try :
sum of 6.85 & 3.91
difference of 3.95 from 4.82
6.05 minus 3.08
2.97