Estimating and measuring time, temperature, mass,

and weight

Lesson 4 (4Lesson 4 (4thth 6 Weeks) 6 Weeks)

TEKS 6.8 A/BTEKS 6.8 A/B

Time

Tools used: clocks and calendars

Units used: seconds, minutes, hours, days, weeks, months, and years

Example:

Mark practices his trombone every day of the week except on Saturday and Sunday. He practices a total of 35 minutes each day. How many hours and minutes will Mark practice his trombone in one week?35x 55

2

17

mins.

60 mins. = 1 hr120 mins. = 2

hrs

175120

-55

2 hrs & 55 mins.

Elasped Time

The amount of time that has passed

Found by counting from the starting time to the finishing time

Example

Winnie gets to work at 7:45 am each morning. She leaves work at 4:15. How long is Winnie at work?

7:45 4:15

8 9 10

11

12

1 2 3 4

7 815

15

8 hrs & 30 mins.

1 2 3 4 5 6

Temperature

Measured with thermometerFahrenheit scale– Customary scale–Water freezes at 32° F–Water boils at 212° F

Celsius scale–Metric system (based on 100)–Water freezes at 0° C–Water boils at 100° C

Example

At 2 p.m. the temperature was 65° F. If the temperature drops 4° F per hour, what will the temperature be at 7 p.m.?

2 pm - 65° F3 pm - 61° F4 pm - 57° F5 pm - 53° F

7 pm - 45° F6 pm - 49° F

Mass and Weight

Similar, but not equalMass: measure of the amount of matter

in an object– A balance is used to measure mass– Use metric units

Weight: measure of how heavy an object is– A spring scale is used to measure weight– Use customary and metric units

Example

Billy buys 2 pounds 8 ounces and 1 pound 10 ounces of ground beef. How many pounds of ground beef did Billy buy?

2 lbs 8 oz1 lbs 10 oz+3 lbs 18 oz

1 lb = 16 oz

+1 lb-16 oz4 lbs 2oz