Unit 2 Review: Homework

Two problems from every lesson in the unit, and one table that uses several of them at once.

Part A — Lessons 1 to 5 / 10

Each problem says which lesson it came from. Write the answer.

1.
(U2-L1) 0.45 ___ 0.405Answer
2.
(U2-L1) Least to greatest: 5.2, 5.02, 5.22, 5.202Answer
3.
(U2-L2) 63.847 to the nearest hundredthAnswer
4.
(U2-L2) 9.96 to the nearest tenthAnswer
5.
(U2-L3) Estimate 7.9 × 5.2Answer
6.
(U2-L3) Estimate 48.3 + 21.8 + 29.6Answer
7.
(U2-L4) 0.6 × 0.35Answer
8.
(U2-L4) 4.8 × 2.5Answer
9.
(U2-L5) 3.07 × 1,000Answer
10.
(U2-L5) 8.5 ÷ 100Answer

Same as before. Work the ones you know first.

1.
(U2-L6) Write 540,000 in scientific notationAnswer
2.
(U2-L6) Write 2.9 × 10^4 in standard formAnswer
3.
(U2-L7) 1.44 ÷ 0.6Answer
4.
(U2-L7) 7.2 ÷ 0.08Answer
5.
(U2-L8) 11 ÷ 6, to the nearest tenthAnswer
6.
(U2-L8) Seven friends share a $30 bill and each must pay enough to cover it. How much does each pay?Answer
7.
(U2-L9) 7.5 km = ___ mAnswer
8.
(U2-L9) 640 mL = ___ LAnswer
9.
(U2-L10) A calculator says 9.8 × 6.1 = 597.8. Is it reasonable? What should it be?Answer
10.
(U2-L10) You have $50 and want items that cost $11.95, $18.40 and $24.99. Round each price to the nearest dollar to see whether $50 is enough.Answer

Real numbers: how fast something speeds up when it falls, in meters per second each second. Each question says which lesson it uses.

Think it through, then write your answer and one sentence about how you knew.

1.
Put these in order from least to greatest without a calculator: 3.5 × 10^3, 3,480 and 0.35 × 10^4. Which two are equal, and how do you know?Answer

Total / 26

Graded by

Notes

Part A — the answers.

Part B — the answers.

5.4 × 10^5
29,000
2.4
90
1.8
$4.29
7,500 m
0.64 L
59.78. It is not reasonable: 10 × 6 = 60, so the decimal point is in the wrong place.
about 55 (12 + 18 + 25), so $50 is not enough. The exact total is $55.34.

Part C — the answers.

a. 1.62 < 3.72 < 9.81 < 24.79 (Moon, Mars, Earth, Jupiter) b. 25 c. about 2.5 times d. 16.74 newtons e. 6.1 times

Part D — one correct answer, and what a good explanation says.

3,480 < 3.5 × 10^3 = 0.35 × 10^4. 3.5 × 10^3 is 3,500. 0.35 × 10^4 moves the point four places and is also 3,500. 3,480 is smaller. (U2-L1, U2-L5, U2-L6)