Copyright © Wright Group/McGraw-Hill of . diameter and 1 2 metric system. little finger is finger little centimeter one about Using personal references:The width of my and the circumference to estimate the lengths of other objects by tiling small rectangles with blocks and area rule—that the circumference of a circle is a little twist-ties to will measure the to find the perimeter. U.S. customary system is also investigated in straws and about 3 times personal references polygon or 2-dimensional figures having perimeter Unit Unit 3: Family Letter

polygons, 10

᭜ inch, and nearest centimeter as they measure a variety of objects, including parts of 2 HOME HOME LINK 1 4 more than 3 times the length of its diameter. Please keep this Family Letter for reference as your child works through Unit 3. In the last part of this unit, children will explore the circles. They will learn the Children will also discover the meaning of counting how many blocks cover the rectangles. Children see how to calculate area by tiling larger surfaces, such as tabletops and floors, with square feet and square yards. connected sides. Then children distance around each build The concept of this unit. Children will use children estimate the length of a room in feet. or distances. For example, a sheet of notebook paper that is about 1 foot long can help 60 some everyday objects as their own bodies, such as their hand spans, wrists, necks, and heights. In addition to the inch and children centimeter, will also measure with other standard units, such as the foot, yard, Children and will meter. begin to use certain body measures or the lengths of standard units—in both the Children will practice reading a ruler to the nearest inch, nearest inch, nearest Linear Linear Measures and Area In Unit 3, children will develop their measurement sense by measuring lengths with Name Date Time EM2007MM_G3_U02.qxd 12/15/05 1:53 PM Page 60 impos03 207:wg00004:wg00004_g3u02:layouts: impos03 60 Page PM 1:53 12/15/05 EM2007MM_G3_U02.qxd EM2007MM_G3_U02.qxd 12/15/05 1:53 PM Page 61 impos03 207:wg00004:wg00004_g3u02:layouts:

Copyright © Wright Group/McGraw-Hill P length with rectangle a of called its called is circle a of perimeter The shape. 2-dimensional measure length. measure to used are kilometers and meters, centimeters, millimeters, example, For world. the around countries most in used is It system. numeration base-ten the on based system measurement circumference perimeter benchmark measurement of system metric system customary U.S. length unit 3: Unit in terms Important Vocabulary yards, and miles are used to measure length. measure to used are miles and yards, feet, inches, example, For States. United the in used liter.meter,kilogram, gallon, pound, foot, references. called also are Benchmarks inch. one about is man’sthumb a of width the that is length for benchmark A acre. one about is field football a that is area land for benchmark a example, For sense. make estimates or measures, counts, other whether check to used be can ϭ 2 An agreed-upon unit of measure, for example for measure, of unit agreed-upon An ϫ The distance between two points. two between distance The ( circumference. l ϩ The distance around the boundary of a of boundary the around distance The w A well-known count or measure that measure or count well-known A ). The perimeter of a circle. a of perimeter The

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2 e ᭜ 10 A w is Unit 3: Family Letter Family 3: Unit P segments of a polygon may not cross. not may polygon a of segments line The path. closed a make to (vertices) endpoints their at only meet that (sides) segments line more other standard measure of length on each side. each on length of measure standard other 1 or yard, centimeter,1 1 inch, 1 measures that there are no gaps or overlaps. or gaps no are there polygon diameter square unit square area tiling square inches or square centimeters. square or inches square as such units, square in measured is Area figure. segment. a such of length The sphere. or circle a of center 1 square centimeter 1 square inch square 1 centimeter square 1 The amount of surface inside a 2-dimensional a inside surface of amount The The covering of a surface with shapes so that so shapes with surface a of covering The A 2-dimensional figure formed by 3 or 3 by formed figure 2-dimensional A A line segment that passes through the through passes that segment line A A unit used to measure area; a square a area; measure to used unit A cont. center a polygon a

diameter 61 Copyright © Wright Group/McGraw-Hill cont. some lengths, and then practice estimating Unit 3: Family Letter the actual lengths. 10 ᭜ 2 HOME HOME LINK measuring around your home. using a ruler by Practice finding perimeters of objects and circumferences of circular objects measurements of length at home. Practice using the personal references by Encourage your child to find some personal references for making several 3. 2. Do-Anytime Do-Anytime Activities To work with your childtry these interesting and rewarding activities: on the concepts taught1. in this unit and in previous units, 62 EM2007MM_G3_U02.qxd 12/15/05 1:53 PM Page 62 impos03 207:wg00004:wg00004_g3u02:layouts: impos03 62 Page PM 1:53 12/15/05 EM2007MM_G3_U02.qxd EM2007MM_G3_U02.qxd 12/15/05 1:53 PM Page 63 impos03 207:wg00004:wg00004_g3u02:layouts:

Copyright © Wright Group/McGraw-Hill 5. a. 3. 1. 3 Link Home 1. 3 Link Home 2. 3 Link Home Links. unit’sHome this through you guide will below listed necessary.answers as The them together,clarifying instructions the over go to want may you assignments, home brings child your As YouAs YourHomework Help with Child perimeter of polygon B polygon of perimeter perimeter of polygon A polygon of perimeter 3 Area 6 Sample answer: Sample answer: Sample answer: Sample 12 ft 12 ϭ then takes all the cards from that round. that from cards the all takes then sum higher the with player The sum. their out calls and cards two over turns player Each Top-ItAddition the see instructions, detailed For games. following the playing by skills addition practice will child your 3, Unit In Games through Skills Building difference then takes all the cards from that round. that from cards the all takes then difference larger the with player The difference. their out calls and cards two over turns player Each Top-ItSubtraction 24 square units square 24 6. 2. 3. b.3. ᭜ ᭜ ᭜ 4 7 5 95 2 60 in. 60 ϭ 2. ϭ HOME LINK HOME 20 cm 20 20 cm 20 2 Area 7. 3. ᭜ 10 ϭ 62 4 27 square 27 Student Reference Book. Reference Student Unit 3: Family Letter Family 3: Unit units 4. 3 .4. 3. 1. 3 Link Home 5. 4. 3. 80 tiles 80 307 Area rectangle. 5-by-4 a is This Area rectangle. 2-by-6 a is This cont. ᭜ 8 7. 6. 5. 2. 6. 307 673 489 plants 30 $160 119 ϭ ϭ 20 square units square 20 units square 12 63