Multiply by 10s & 100s
A teacher orders 6 boxes of markers. Each box has 40 markers. How many markers are ordered?
240 markers
A school sold 194 notebooks for $4 each. About how much money did the school collect?
About $800 because 194 ≈ 200 and 4 × 200 = 800.
There are 4 shelves with 32 books on each shelf. How many books are there altogether?
128 books. 4 × 30 = 120; 4 × 2 = 8; 120 + 8 = 128.
A teacher places 34 books on each of 3 shelves. How many books are there altogether? Use an area model to solve.
102 books. Break 34 into 30 + 4. 3 × 30 = 90 and 3 × 4 = 12. 90 + 12 = 102.
A teacher buys 4 packs of markers with 36 markers in each pack. She gives 20 markers to another class. How many markers does she have left?
4 × 36 = 144
144 − 20 = 124 markers
A school has 8 classrooms with 300 sheets of paper in each room. How many sheets of paper are there altogether?
2,400 sheets
A farmer packs 312 oranges into each of 6 large shipments. About how many oranges are shipped?
About 1,800 oranges because 312 ≈ 300 and 6 × 300 = 1,800.
A teacher gives 6 stickers to each of 43 students. How many stickers are needed?
258 stickers. 6 × 40 = 240; 6 × 3 = 18; 240 + 18 = 258.
A garden has 4 rows with 56 plants in each row. How many plants are there? Use an area model.
224 plants. 56 = 50 + 6. 4 × 50 = 200 and 4 × 6 = 24. Total = 224.
A school orders 5 boxes of pencils with 128 pencils in each box. Then it receives 60 more pencils. How many pencils does the school have altogether?
5 × 128 = 640
640 + 60 = 700 pencils
A theater sold 7 groups of 500 tickets. How many tickets were sold?
3,500 tickets
A concert sold 487 tickets at $5 each. About how much money was collected?
About $2,500 because 487 ≈ 500 and 5 × 500 = 2,500.
A farm packs 3 crates with 126 apples in each crate. How many apples are packed?
378 apples. 3 × 100 = 300; 3 × 20 = 60; 3 × 6 = 18; total = 378.
A school buys 3 boxes with 185 pencils in each box. How many pencils are purchased? Show how an area model can break apart 185.
555 pencils. 185 = 100 + 80 + 5. 3 × 100 = 300, 3 × 80 = 240, 3 × 5 = 15. Total = 555.
A library has 3 shelves with 245 books on each shelf. It donates 85 books. How many books remain?
3 × 245 = 735
735 − 85 = 650 books
A fundraiser sold 9 bundles of 60 raffle tickets. How many raffle tickets were sold?
540 tickets
A student says that 7 × 218 = 4,526. Use estimation to decide whether the answer is reasonable.
Not reasonable. 218 ≈ 200, so 7 × 200 ≈ 1,400.
A school orders 5 boxes containing 214 pencils each. How many pencils are ordered altogether?
1,070 pencils. 5 × 200 = 1,000; 5 × 10 = 50; 5 × 4 = 20; total = 1,070.
A concert hall has 8 sections with 440 seats in each section. How many seats are there altogether? Use an area model or partial products.
3,520 seats. 440 = 400 + 40. 8 × 400 = 3,200 and 8 × 40 = 320. Total = 3,520.
A fundraiser sells 6 boxes of candy with 175 pieces in each box. Students give away 150 pieces as samples. How many pieces are left to sell?
6 × 175 = 1,050
1,050 − 150 = 900 pieces
A museum charges $20 for each student group. Seven groups visit the museum. How much money is collected?
$140
A store sold 154 water bottles for $4 each. Use a compatible number to estimate the total sales.
About $600 because 154 is close to 150 and 4 × 150 = 600.
Four buses are taking students on a field trip. Each bus carries 237 students and adults over several trips. How many riders are transported altogether?
948 riders. 4 × 200 = 800; 4 × 30 = 120; 4 × 7 = 28; total = 948.
A warehouse packs 7 cartons with 265 notebooks in each carton. How many notebooks are packed altogether? Explain how the sections of an area model represent the multiplication.
1,855 notebooks. 265 = 200 + 60 + 5. 7 × 200 = 1,400; 7 × 60 = 420; 7 × 5 = 35. 1,400 + 420 + 35 = 1,855.
A teacher orders 6 boxes of notebooks with 145 notebooks in each box. She gives 120 notebooks to another class. How many notebooks does she have left?
6 × 145 = 870
870 − 120 = 750 notebooks