2 multiple product factors round Review What You Knowmultiple product factors roundOne way to estimate with numbers is to ___________ each number.A ____________ is the answer to a multiplication problem.In the equation 9 x 5 = 45, the 9 and 5 are both ___________.
3 Round each number to the place of the highlighted digit. RoundingRound each number to the place of the highlighted digit.8646,51834,8269,8514,513,617749,2485,376,45799,999191,111,111
4 Multiplication Find each product. 13 x 9 25 x 16 43 x 86 61 x 94
5 Suzi went to a craft fair and bought 3 quilts for $45 each and 3 sun- catchers for $12 each. How muchdid she spend?
6 How do you multiply 3-digit numbers by 2-digit numbers? Last month a bakery sold traysof bagels. How many bagels did thestore sell last month?12 bagelsper tray
7 Do You Know How ?2 3 6x 4 64 2 5x 6 11 1 6x 7 27 8 5x 5 84 9 8x 4 24 6 1x 1 3
8 Do You Know How ?7 6 3x 1 95 1 5x 3 56 2 9x 4 71 8 5x 5 52 2 7x 8 79 4 6x 4 3
11 The Mrs. Bell’s fourth-grade class at Orange Street Elementary sold morebags of popcorn than any other class.They ordered 17 cases of popcorn.Each case had bags. How manybags of popcorn did the class sell?
12 The Theater in Daytona Beach can seat 540 people at one time. How many tickets can be sold if thetheater sells out every seat for one30-day month?
13 It takes Mars 687 Earth days to revolve around the Sun It takes Mars Earth days to revolve around the Sun. How many Earth days does it take Mars to revolve 24 times around the Sun?
14 A nursery sells plants by the flat. There are 6 plants in each tray. Eachflat has 6 trays. The nursery sold 16flats on Saturday and 21 flats onSunday. How many plants did thenursery sell in all?
15 The length of the Nile River in Africa is about 14 times the length of LakeMichigan. About how many miles longis the Nile River?LakeMichigan300MilesLong
16 Multiply with zeros to see if your answer is reasonable. An antique steam train makes one sight-seeing tour each day. If every seat is filled for each trip, how many passengers can it carry for 31 tours?The Trainhas a totalof 208 seats.
17 Multiply by zeros to estimate. Then solve. Suppose an average of only seatsare filled for each train tour. What isa reasonable estimate for the numberof passengers the train can carry in28 tours?
18 Estimate – then solve 3 0 2 x 1 7 6 0 8 x 2 3 1 0 9 x 4 7 5 1 0 x 7 2 7 0 6x 3 09 0 7x 5 28 0 5x 8 02 0 6x 3 4
19 Estimate – then solve. 9 0 2 x 3 5 2 0 7 x 6 1 1 0 8 x 5 8 5 0 5 x 7 7 6 0 4x 4 94 0 1x 8 03 2 07 0 3x 9 3
20 Jimmy orders loaves of bread each day from the bakery for his dad’s Deli. He gets a variety of white, wheat, and rye. Each loaf costs $2. How much does Jimmy spend daily for bread?
21 A flight departs at 8:45 a. m. It arrives 2 hours and 15 minutes later A flight departs at 8:45 a.m. It arrives 2 hours and 15 minutes later. What time does the flight arrive?
22 There are 5 adult skeletons on display in an exhibit in a science museum.How many bones arethere in all?An adulthas 206bones.
23 There are more bones in a child’s body because some of a child’s bones fuse together as they grow. How many more bones are in a child’s body than in an adult’s body?A child has300 bones.
24 Explorers from Spain first came to Florida in 1513. After 308 years, Spain gave up control of Florida to theUnited States. In what year did thischange happen?
25 What figure has eight sides and eight angles? What would a net look like to build thisgeometric solid?
27 Construction paper comes in packs of 275 sheets. How many sheets of construction paper are in 2 gross?Hint: 1 gross = 12 dozen or 144
28 Lauren was captain of 168 full flights on the J-119 last fall. How manypassengers did she have on herflights last fall?JETLINERSEATSJ-056152J-119247J-211295
29 Fido’s dog food gives him 975 calories of energy a day. How many caloriesdoes he get from his food in 7 days?
30 Renting a boat at a marina costs $289 a day. In one month, the marina rented boats times. How muchmoney did they earn from the rentals?
31 Laura and Ryan both got new sun glasses. Laura’s sunglasses cost $275. Ryan’s sunglasses cost $80 less.How much did they pay for theirsunglasses all together?
32 A class is building a model of their community A class is building a model of their community. They have 12 complete sets of building blocks. How many building blocks can the class use to build the model?1,025 blocksper set
34 Seminole leaderOsceola died inA Florida county wasnamed in hishonor 49 years later.In what yeardid Osceola County getits name?
35 There were 4,017 fans at the rodeo championship. Each fan paid $5 for admission. How much money wascollected in all?
36 On average, each American produces 1,657 pounds of trash in one year. About how much trash does eachAmerican produce in 10 years?
37 Maggie walks dogs and delivers papers to earn money. This month, she earned$54 delivering papers and $41 walkingdogs. She spent $12 on a new watch.How much money doesMaggie have left this month?
38 A rectangular flag has a length of 209 feet and a width of 110 feet. What is the perimeter? P = 2L + 2WWhat is the area? A = L x W
39 In 2007, Florida’spopulation wasestimated at18,680,367. Whichdigit is in the tenmillions place?
40 An electronic word-search puzzle game is programmed with 1,225 word-searchpuzzles. How many letters wereneeded to create all of the puzzles forthe games?Each puzzleuses 144letters.
41 Each puzzle has 15 hidden words. If you complete 174 puzzles, how many words will you have found?
42 Find each product by estimating the range. 89 x 17480 x 100 = 800090 x 200 = 18000RANGE8000 to 18000836 x 7,294305 x 814333 x 2,222112 x 42649 x 311286 x 61541 x 809
43 Estimates show that an average family in America uses about gallons ofwater per day. At this rate, how muchwater would a family use in days?
44 The earth is always rotating even though you cannot feel it. A point on theequator travels about 1,038 miles everyhour. How far would the point travelover 12 hours?
45 A recycling center recycles about 1,250 aluminum cans each day. At that rate,how many cans would be recycledin 31 days?
46 The official distance of a modern marathon is 26 miles, plus 1,155 feet.There are 5,280 feet in one mile.How many feet are in a marathon?
47 Lake Okeechobee is Florida’s largest lake Lake Okeechobee is Florida’s largest lake. A 110-mile trail loops around its shore. Melanie has biked 73 miles of the trail so far. How many miles does she have left in order to complete the whole trail?
48 On average, it takesabout 2,500 pearls todecorate a gown.If a dress shop expectsto sell beadedgowns, about howmany pearls will beneeded?
49 Flight 719 carries 39 passengers. Each passenger brings 2 suitcases Flight carries 39 passengers. Each passenger brings 2 suitcases. The airplane can safely carry 5,000 pounds of luggage. Is an exact answer needed or is an estimate enough to decide if the luggage for this flight is under the weight limit?Average weight36 pounds persuitcase
50 There are 44 adults that want to take a group tour of Mexico City. The costof each ticket is $12. Is an exactanswer needed or is an estimateenough to find the total cost of thetickets?
51 Norma bought two Tee-shirts for $14 each and a pair of shorts for $18. She paid with a 50-dollar bill. Howmuch change did she get back?
52 At a craft fair, Sandra sold 13 bracelets, 24 pairs of earrings, and 7 necklaces.How much did she make in all?$18Bracelets@$15$23
53 Andy wants to make at least $2000 at the craft fair Andy wants to make at least $2000 at the craft fair. She sold 18 necklaces, 28 pairs of earrings, and 16 bracelets. Did she sell enough to meet her goal?ANDY’S JEWELRYEARRINGS$19BRACELETS$17NECKLACES$28
54 Carla’s highest score on a video game is 398,540 points. Connor has a highscore of 407,735 points. What is thedifference between both scores?Is an exact answer needed or is anestimate good enough?
55 A sports store sold 536 baseball caps during a clearance sale. The goal wasto sell at least caps. How manymore caps did the store need to sell toreach their goal?
56 A 10-pound bag of puppy food has about 8,130 pieces of food. How many pieces of food are in 25 bags ofpuppy food?
57 The pet store sold 28 bags of kitty litter during the first day of the sale. Howmuch money did the store earn onthese bags?KITTY LITTERON SALE TODAYEach 50 pound bag only $14PUPPY FOODEach 10-pound bag on $19
58 Band members at one school plan to practice 6 hours a week forweeks to prepare for competition.Which equation shows howto find how much time the bandmembers will practice?20 x 10 = 20021 x 7 = 14721 x 6 = 12620 x 5 = 100
59 A one-month city bus pass costs $39. Which of the following expressionscould you use to find the cost of thebus pass in dollars for one year?or 12 x or or 52 x 39
60 Britton Hill, Florida, is the location of the highest point in the state. It is feet abovesea level. About how manysabal palms on top of eachother would equal the heightof the highest point?TREE: SABAL PALM - AVERAGE HEIGHT IS 50 FEET
61 FLORIDA LARGEMOUTH BASS What is the difference between the greatest and least number of eggs that a female largemouth bass may lay?FLORIDA LARGEMOUTH BASSNUMBER OF EGGSBETWEEN 2,000 AND 145,000Life Span: up to16 years
62 If a female largemouth bass lays an average of 4,000 eggs each year, howmany eggs might she lay in herlifetime?Life Span:up to 16 years
63 Find the Product.54 x 11916 x 92313 x 18955 x 12567 x 48281 x 19951 x 62532 x 871
64 Find the Product.34 x 10876 x 50447 x 30283 x 20655 x 60494 x 70868 x 40921 x 807
66 Find each product.67 x 4,15221 x 3,946365 x 407614 x 8422,056 x 6389,345 x 8717,777 x 8882,948 x 502
67 Tell whether an exact answer is needed or an estimate is enough. Remember that an estimate may be all you need to solve a problem when the words “about” and “almost” are used in the question.Tell whether an exact answer is needed or an estimate is enough.Then solve.
68 Mrs. Hodges is making name tags for the members of the Garden Club. She must make tags for 18 girls and13 boys. How many name tags mustshe make?
69 On Tuesday, a snack bar sold 309 big pretzels, 286 boxes of popcorn, and 78 bags of peanuts. About howmany snacks did the snack bar sell?