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Entry Task: October 1st Monday
GRAB A NEW ENTRY TASK SHEETQuestion:
12.34 cm X 1.2 cm = _____cm
You have 5 minutes!
Agenda
• Sign off and discuss Math & Sci numbers• Self Check- on Scientific Numbers- Ch. 2• P of U on Ch. 2
1. Determine the number of significant digits in each of the following.
a) 6.751g c) 2500 m e) 0.106 cm
b) 0.157 kg d) 0.070 g f) 0.0067 g
4
3
2-4
2
3
2
1. Determine the number of significant digits in each of the following.
g) 26.509 cm i) 2.690 g
h) 54.52 cm3 j) 43.07 cm
5
4
4
4
2. Convert to the appropriate units and place into Scientific notation. K h da b d c m
a) 0.075 kg to mg
b) 1500 mm to km
c) 0.036 m to mm
d) 1.00 kL to dL
75000 mg 7.5 x 104 mg
0.001500 km 1.500 x 10-3 km
36 mm 3.6 x 101 mm
10000 dL 1.00 x 104 dL
2. Convert to the appropriate units and place into Scientific notation. K h da b d c mg) 65 ml to hl
h) 750 kg to g i) 2.36 hg to g
0.00065 hL 6.5 x 10-4 hL
750000 g 7.50 x 105 g
236 g 2.36 x 102 g
3. Add these measurements
a) 16.5 cm + 8 cm + 4.37 cm =
b) 13.25 g + 10.00 g + 9.6 g =
c) 2.36 m + 3.38 m + 0.355 m + 1.06m =
d) 0.0853 g + 0.0547 g + 0.037g + 0.00387 g =
28.87 or 29 cm
32.85 or 32.9 g
7.155 or 7.16 m
0.18087 or 0.181 g
4. Subtract these measurements a) 23.27 km - 12.058 km =
b) 13.57 g - 6.3 g =
c) 350.0 m - 200 m =
d) 27.68 cm - 14.369 cm =
11.212 or 11.21 km
7.27 or 7.3 g
150m
13.311 or 13.31 cm
5. Multiply these measurements a) 2.6 cm x 3.78 cm =
b) 6.54 m x 0.37 m =
c) 0.036 m x 0.02 m =
d) 3.08 km x 5.2 km=
9.828 or 9.8 cm2
2.4198 or 2.4 m2
0.00072 or 7 x 10-4 m2
16.016 or 16 km2
6. Divide these measurements
a) 35 cm 0.62 cm =
b) 39 g 24.2 g =
c) 0.58 dm 2.15 dm =
d) 40.8 m 5.050 m =
56.45 or 56
56.45 or 56
0.2697 or 0.27
8.0792 or 8.08
Write the following numbers in Scientific notation. a. 0.0045834 mm
b. 438904 s
c. 0.03054 g
d. 7004300000 g
4.5834 x10-3 mm
4.37904 x105 s
3.054 x10-2 g
7.004300000 x109 g
Write the following numbers in ordinary notationa. 8.348 x 106 km
b. 7.6352 x 10-3 kg
c. 3.402 x 103 g
d. 3.02 x 10-5 s
8348000 km
0.0076352 kg
3402 mm
0.0000302 s
Convert the following measurements then place them into scientific notation
k h da b d c m a. 5.70 g to mg
b. 4.37 cm to m
c. 783 kg to g
d. 45.3 mm to m
e. 10 m to cm
f. 0.0015 hg to dg
5700 mg or 5.70 x 103 mg
0.0437 m or 4.37 x 10-2 m
783000 g or 7.83 x 105 g
0.0453 mm or 4.53 x 10-2 mm
1000 cm or 1.0 x 103 cm
1.5 dg
Complete the following addition and subtraction measurement problems. REMEMBER THE RULES
a. 6.23 kL + 5.341 kL =
b. 3.1 mm + 4.87 mm =
c. 7.5 kg - 5.43 kg =
d. 6.48 mm - 2.8 mm =
11.57 kL
8.0 mm
2.1 kg
3.7 mm
Complete the following multiplication and division measurement problems. REMEMBER THE RULES
a. 4.8 km X 2.01 km =
b. 15.2 mm X 3.00 mm =
c. 8.421 kg ÷ 2.43 kg =
d. 10.20 mm ÷ 1.120 mm =
9.6 km2
45.6 mm2
3.47
9.107
Why are significant figures so important in scientific data?
Using two different instruments, I measured the length of my foot. Ruler #1 measured it to be 22.00 centimeters and ruler #2 had a measurement of 22 centimeters. Explain the difference between the two measurements.
The more numbers in your measurement the more precise the measuring tool.
Ruler 1 has 4 significant figures in its measurement verse Ruler 2 which has 2. Ruler 1 is more precise than Ruler 2.
Rounding and reading
Round 507,209,600 to … (Place in correct scientific notation)
2 S.F. _______________
4 S.F. ________________
6 S.F. _________________________
9 S.F. _______________________
5.1 x 108
5.072 x 108
5.07210 x 108
5.07209600 x 108
Refer to the following measurement tool. In grams.
What is the reading on this scale and underline your uncertainty?
How many significant figures are in your measurement?
0.00260 g
3 sig figs
Ch. 2 Sci Numbers ReviewSTUDY FOR P of U