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