Msm1 fl ch01_04
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1-4 Choosing a Method of Computation Warm Up Warm Up Lesson Presentation Lesson Presentation Problem of the Day Problem of the Day Lesson Quizzes Lesson Quizzes
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Transcript of Msm1 fl ch01_04
1-4 Choosing a Method of Computation
Warm UpWarm Up
Lesson PresentationLesson Presentation
Problem of the DayProblem of the Day
Lesson QuizzesLesson Quizzes
1-4 Choosing a Method of Computation
Warm UpUse mental math to find each fraction of 80.
1. 2.
3. 4.
40 8
20
110 __1
2
1614
15
1-4 Choosing a Method of Computation
Problem of the Day
About 23% of 600 firefighters are not on duty on any particular day. Steven estimates that about 200 firefighters have the day off. Is his estimate too high or too low? Explain.
too high; 25% of 600 is 150
1-4 Choosing a Method of Computation
Prep for MA.6.A.1.1 Explain and justify procedures for multiplying and dividing fractions and decimals.
Also Review of MA.5.A.1.2
Sunshine State Standards
1-4 Choosing a Method of Computation
Additional Example 1A
Simplify the expression and state the method of computation you used.
Look for sums that are multiples of 10. You can use mental math.
35
4 + 3 + 2 + 10 + 8 + 2 + 5 + 1
1-4 Choosing a Method of Computation
Additional Example 1B
Simplify the expression and state the method of computation you used.
4,562 – 397
397 is close to a multiple of 100.
You can use pencil and paper.
(4,562 + 3) – (397 + 3)
4,565 – 400
4,165
Think: Add 3 to 397 to make 400. Add 3 to 4,562 to compensate.
1-4 Choosing a Method of Computation
Additional Example 1C
Simplify the expression and state the method of computation you used.
9,288 ÷ 24.
The numbers are not compatible, so mental math is not a good idea. You could use paper and pencil, but long division requires several steps. Using a calculator will probably be faster.
387
1-4 Choosing a Method of Computation
Look for sums that are multiples of 10. You can use mental math.
42
Check It Out: Example 1A
Simplify the expression and state the method of computation you used.
3 + 7 + 2 + 18 + 7 + 1 + 3 + 1
1-4 Choosing a Method of Computation
Check It Out: Example 1B
Simplify the expression and state the method of computation you used.
3,442 – 298
298 is close to a multiple of 100.
You can use mental math.
(3,442 + 2) – (298 + 2)
3,444 – 300
3,144
Think: Add 2 to 298 to make 300. Add 2 to 3,442 to compensate.
1-4 Choosing a Method of Computation
Check It Out: Example 1C
Simplify the expression and state the method of computation you used.
9,248 ÷ 32.
The numbers are not compatible, so mental math is not a good idea. You could use paper and pencil, but long division requires several steps. Using a calculator will probably be faster.
289
1-4 Choosing a Method of Computation
Standard Lesson Quiz
Lesson Quizzes
Lesson Quiz for Student Response Systems
1-4 Choosing a Method of Computation
Lesson Quiz
Simplify the expression and state the method of computation you used.
1. 17 + 6 + 24 + 35 + 3 + 5
2. 63 197
3. It takes Jupiter approximately 4,344 days to
complete one revolution around the Sun. It
takes Earth 365 days to revolve around the
Sun. How many more days does it take Jupiter
to revolve around the Sun than Earth?
12,411; paper and pencil
90; mental math
3,979 days; calculator
1-4 Choosing a Method of Computation
1. Simplify the expression and state the method of computation you used.
16 + 3 + 21 + 37 + 4 + 9
A. 90; mental math
B. 100; paper and pencil
C. 80; mental math
D. 80; paper and pencil
Lesson Quiz for Student Response Systems
1-4 Choosing a Method of Computation
2. Simplify the expression and state the method of computation you used.
74 189
A. 14,000; mental math
B. 13,986; paper and pencil
C. 14,364; mental math
D. 14,364; paper and pencil
Lesson Quiz for Student Response Systems
1-4 Choosing a Method of Computation
3. Kenneth’s company produces 346 cycles per day. How many cycles does it produce in 43 days?
A. 13,470 cycles; mental math
B. 13,470 cycles; paper and pencil
C. 14,000 cycles; mental math
D. 14,878 cycles; calculator
Lesson Quiz for Student Response Systems
