MU15L2D11 Measuring to the Nearest Tenth Unit 15, Lesson 2, Day 1

MU15L2D1 2 DPP F Be sure to use your centimeter ruler when measuring these line segments

MU15L2D1 3 Math Vocabulary Review common fraction; fraction – any fraction that is written with a numerator and denominator that are whole numbers. For example, 3/4 and 9/4 are both common fractions. decimal fraction; decimal – A fraction written as a decimal. For example, 0.75 and 9.4 are decimal fractions and 75/100 and 4/10 are called common fractions.

MU15L2D1 4 Math Vocabulary Review hundredth – there are one hundred hundredths in a one tenth there are ten tenths in a one

MU15L2D1 5 Math Vocabulary nearest tenth of a centimeter – this is the tenth of a centimeter that is closest to the end of whatever you are measuring

MU15L2D1 6 Essential Question How close do measurements have to be?

MU15L2D1 7 Part 1 Reading a Centimeter Ruler Student Guide Pgs. 222 and 223 A reasonable level of accuracy depends on what is being measured and why. In measuring the distance to the moon, a measurement within a few meters is remarkably accurate. However in measuring the classroom width, the same amount of error would be cause for alarm.

MU15L2D1 8 Part 1 Reading a Centimeter Ruler If you are estimating the amount of paint necessary to cover a door frame, measurement accurate to within few centimeters is more than good enough. However, if a carpenter cutting a door to fit the frame applies the same amount of accuracy, the door probably will not fit.

MU15L2D1 9 Part 1 Reading a Centimeter Ruler Student Guide Pgs. 222 and 223. These two pages show how each centimeter is divided into smaller pieces of equal size. Since there are ten equal pieces, each piece represents one-tenth of a centimeter.

MU15L2D1 10 Teacher Notes – Part 1 Reading a Centimeter Ruler Student Guide Pg. 224 – Questions 1 – 3 Students measure the lengths of three rows of hexagons to the nearest centimeter and then to the nearest half-centimeter. Discuss which measurement gives a more accurate answer.

MU15L2D1 11 Teacher Notes – Part 1 Reading a Centimeter Ruler Student Guide Pgs. 224 – 225 – Questions 4 – 7 Ask students to read centimeter rulers to the nearest centimeter, half centimeter, and tenth of a centimeter. Students have already learned how to choose the centimeter or half centimeter mark closes to to the length of an object. Now they will choose the closest tenth of a centimeter.

MU15L2D1 12 Teacher Notes – Part 1 Reading a Centimeter Ruler Student Guide Pg. 225 – Questions 8 – 10 Students use rulers drawn in nonstandard positions to find the widths of various rectangles.

MU15L2D1 13 Teacher Notes – Part 1 Reading a Centimeter Ruler Student Guide Pg. 226 – Questions 11 – 14 Students use a ruler to make their own measurements to the nearest tenth of centimeter. Questions 11 and 15 may have the students question which is the length and which is the width.

MU15L2D1 14 Teacher Notes – Part 1 Reading a Centimeter Ruler Student Guide Pg. 226 – Question 15 Discuss strategies for accurately measuring lengths longer than a ruler. Students may need additional practice in measuring to the nearest tenth of a centimeter when finished with these figures.

MU15L2D1 15 Math Vocabulary Review common fraction; fraction – any fraction that is written with a numerator and denominator that are whole numbers. For example, 3/4 and 9/4 are both common fractions. decimal fraction; decimal – A fraction written as a decimal. For example, 0.75 and 9.4 are decimal fractions and 75/100 and 4/10 are called common fractions.

MU15L2D1 16 Math Vocabulary Review hundredth – there are one hundred hundredths in a one tenth there are ten tenths in a one

MU15L2D1 17 Essential Question How close do measurements have to be?