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# Fractions lesson

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RBM Math Unit 3 fractions lesson

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### Fractions lesson

1. 1. Fractions Lesson: <br />Measuring and Adding Fractions<br />
2. 2. Measuring FractionsMeasuring Fractions on a Tape Measure.<br />Trades workers constantly read and measure fractions when using the Imperial system. Errors in measurements are costly both in time and money. Experienced trades persons measure twice and cut once.<br />Trades workers work mostly in halves, fourths, eighths, sixteenths and occasionally, in thirty-seconds depending on the degree of accuracy required. <br />It is important to be able to determine precise measurements on a tape measure. <br />
3. 3. Measuring FractionsMeasuring Fractions on a Tape Measure.<br />The tape measure below identifies four fractions on an Imperial measuring tape. Understanding the measurements on a tape measure is very important to ensure quality work. Can you identify the measurements below?<br /> 2 3 4<br />
4. 4. Adding Fractions: 1<br />Step 1: <br />Determine the common denominator. Do not change mixed numbers or whole numbers to improper fractions.<br />Step 2:<br />Add the numerators and place the answer over the denominator. Do not add the denominators. Add the whole numbers.<br />Step 3: <br />Express fractions in lowest terms<br />
5. 5. Adding Fractions:2Determine the total width of the three pieces of wood in the countertop.<br />Step 1: Determine the common denominator for the wood pieces in the countertop below. <br />3 = 3 6 = 6 2<br />Step 2: Add the numerators. <br />Place the number over the denominator. <br />Add the whole numbers.<br /> 3 + 6 + 2 = 11 <br />Step 3. Express the fractions in lowest terms.<br />11 <br />
6. 6. Adding Fractions:3Determine the length of B in the construction drawing.<br />Step 1: Determine the common denominator for the fractions found for measurement B. <br />Common denominator is <br />8'-0" + 10'-6 " + 3'- " + 6'-0"<br />Step 2: Add the numerators. <br />Place the number over the denominator. <br />Add the whole numbers.<br />8'-0" + 10'- 6 " + 3'- " + 6'- 0" = 27'- 6 "<br />Step 3. Express the fractions in lowest terms.<br />27'-7<br />