1. Entry Task: October 1st Monday
GRAB A NEW ENTRY TASK SHEET
Question:
12.34 cm X 1.2 cm = _____cm
You have 5 minutes!

2. Agenda Sign off and discuss Math & Sci numbers
Self Check- on Scientific Numbers- Ch. 2
P of U on Ch. 2

4. 1. Determine the number of significant digits in each of the following.
a) g c) m e) cm  
0.157 kg d) g f) g 3 4
2-4 3 2 2

5. 1. Determine the number of significant digits in each of the following.
g) cm i) g
h) cm3 j) cm 5 4 4 4

6. Convert to the appropriate units and place into Scientific notation
Convert to the appropriate units and place into Scientific notation. K h da b d c m
a) kg to mg  
b) mm to km  
0.036 m to mm
d) kL to dL
75000 mg
7.5 x 104 mg km
1.500 x 10-3 km
36 mm
3.6 x 101 mm
10000 dL
1.00 x 104 dL

7. 2. Convert to the appropriate units and place into Scientific notation
2. Convert to the appropriate units and place into Scientific notation K h da b d c m
g) 65 ml to hl
h) 750 kg to g
i) hg to g hL
6.5 x 10-4 hL g
7.50 x 105 g
236 g
2.36 x 102 g

8. 3. Add these measurements
a) cm cm cm =
13.25 g g g =
c) m m m m =
d) g g g g =
or 29 cm
or g
or m
or g

9. 4. Subtract these measurements
23.27 km km =
13.57 g g =
c) m m =
d) cm cm =
or km
7.27 or 7.3 g
150m
or cm

10. 5. Multiply these measurements
2.6 cm x cm =
6.54 m x m =
c) m x 0.02 m =
d) km x 5.2 km=
or 9.8 cm2
or 2.4 m2
or 7 x 10-4 m2
or 16 km2

11. Divide these measurements
35 cm  0.62 cm =
39 g  24.2 g =
0.58 dm  dm =
d) m  m =
or 56
or 56 or or

13. Write the following numbers in Scientific notation.
a mm
b s g
d g
x10-3 mm
x105 s
3.054 x10-2 g
x109 g

14. Write the following numbers in ordinary notation
a x 106 km
b x 10-3 kg
c x 103 g
d x 10-5 s km kg
3402 mm s

15. Convert the following measurements then place them into scientific notation
k h da b d c m
a g to mg
b cm to m
c. 783 kg to g
d mm to m
10 m to cm
f hg to dg
5700 mg or 5.70 x 103 mg
m or 4.37 x 10-2 m
g or 7.83 x 105 g
mm or 4.53 x 10-2 mm
1000 cm or 1.0 x 103 cm
1.5 dg

16. Complete the following addition and subtraction measurement problems
Complete the following addition and subtraction measurement problems. REMEMBER THE RULES
a kL kL =  
b. 3.1 mm mm =
c kg kg =
d mm mm =
11.57 kL
8.0 mm
2.1 kg
3.7 mm

17. Complete the following multiplication and division measurement problems. REMEMBER THE RULES
4.8 km X km =
b mm X mm =
c kg ÷ kg =
d mm ÷ mm =
9.6 km2
45.6 mm2
3.47
9.107

18. 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 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.

19. 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
x 108
x 108

20. 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? g
3 sig figs

21. Ch. 2 Sci Numbers Review
STUDY FOR P of U