Math: Unit 6 Study Guide
I.
Name _________________________
Vocabulary: Know these vocabulary terms.
 rounding – adjusting a number so it’s easier to work with
 estimate – approximate number; not exact
 product - answer to a multiplication problem
 factor – one of the numbers being multiplied
 quotient – the answer to a division problem
 dividend – in a division problem, the number being divided
 divisor – in a division problem, the number doing the dividing
 acute angle – angle measuring less than 90o
 right angle – angle measuring 90o
 obtuse angle – angle measuring more than 90o but less than 180o
II. Multiplication and Division: Given a word problem, be able to write a number
model; be able to multiply and divide 2- and 3-digit numbers.
Examples:
There are 65 pencils. Four teachers decide to share them equally. How many
pencils will each teacher get?
Number model with unknown:
65÷4=p
Answer: 16 pencils
16 R 1
Summary number model: 65/4 = 16 = 16 R1
4 65
-40
10
25
Divide 383/8.
8 383
- 320
40
63
- 56
7
7
47
 47 R7
-24
6
1
16
14 students are going on a trip. They must each pay $22. How much in total will
they spend? ______$308___________
1
4
0
0
2
8
2
22
0
2
Try it:
3
0
2
0
8
8
Three siblings made $507 from a recent yard sale. They will share the money
equally. How much money will each sibling get?
Number model: _________________________
Answer: ___________
Summary model: ____________________
Divide 732/6.
Multiply 38 * 22.
III. Angles: Be able to identify angles as acute, right, or obtuse. Be able to measure
angles using a protractor.
acute
right
___880______
obtuse
Try it:
acute right obtuse
IV.
acute right obtuse
Coordinate grids: Be able to plot points on a coordinate grid.
0
1
2
3
4
5
6
Try it: On the coordinate grid above, label the y-axis and plot these points: D (5,0)
E (2,2) F (5,3)
V.
Parentheses: Be able to insert parentheses to make number sentences true.
Example:
12 = 15 - 2+1 => 12 = 15 –(2+ 1)
Try it:
a. 5 * 4 – 2 = 18
b. 25 + 8 * 7 = 81
VI.
Rounding: Be able to round numbers to the nearest ten thousands.
Example:
473,092 => 470,000
Try it:
a. 3,941,502 __________________
b.
485,904,330 ___________________