Measurement and Units

Rulers- Do Now How do you read a ruler? Why are rulers important? What are some examples of careers where rulers are necessary?

Reading a Ruler

Some Things To Note: Each long line labeled with a number represents the whole number place(s) Each smaller line is a fraction, decimal or “A little bit more” of that whole number When measuring in centimeters, each smaller line is worth 0.1 (a tenth of a centimeter)

Add to get the full value to the nearest tenth If on a whole number line, add .0 if the measurement needs to be to the nearest tenth Example: _12.0_________

ROUNDING

Rules for Rounding 1. When rounding to a place, look to the number to the right of the number in question. Example: If you are rounding to the nearest tenth, look at the hundredths place

2. If the number to the right of the number in question is a. Less than 5, keep the number in question the same and drop all numbers to the right b. Greater than or equal to 5, increase the number in question by 1 and drop all the numbers to the right

Round to the nearest tenth: 7.8832 Round to the nearest thousandth: 234.24325

Units Units tell you what is being measured Distance is measured in: meters, centimeters, millimeters, miles, feet, etc and is measured with some kind of ruler Mass or weight is measured in: grams, kilograms, pounds and ounces and is measured with some kind of scale

Units and Math When adding or subtracting numbers with the same units, the units stay the same A. Example: 2 grams + 8 grams = 10 grams When multiplying units that are the same, each time you “times” an exponent is added Example: 3 gramsx1 gram x 4 grams = 12 grams cubed or 12 g3

When multiplying different units, they carry Example: 2 oranges X 5 apples = 10 apples and oranges When dividing, units that are the same on the top and bottom cancel out

If dividing and the units are different, carry them through

Video Watch the following video. While you’re watching the video, write down at least 3 things that you find important, interesting, or helpful in remembering the concepts presented. Jot these notes on the fill-ins or in your notes, depending on where you wrote down the concepts https://www.youtube.com/watch?v=7omxmCDpW7U