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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 ___________________