Standard Algorithm
What is 24 × 13?
312
Use an area model to solve:
23 x 15
345
A factory has 17 flights of stairs with 22 stairs in each flight.
How many stairs are there?
374 stairs
Estimate 45 × 16 by rounding to the nearest ten.
1,000
Armani has 34 hats. Jenilyn has 12 times as many. How many hats does she have?
408 hats
What is 46 × 28?
1,288
Find the product of:
57 × 18
1,026
Javilin buys 35 packages of balloons with 18 balloons in each package.
How many balloons are there in all?
630 balloons
Estimate 222 × 783.
160,000
Theo saved $143. His parents saved 11 times as much. How much did they save?
$1,573
What is 82 × 73?
5,986
For 34 × 12, what are the four partial products in an area model?
300, 40, 60, and 8
A farmer plants 65 rows of 158 blueberry plants.
How many plants are there altogether?
10,270 plants
Estimate 412 × 176.
80,000
A bakery sold 24 muffins on Monday. On Tuesday, it sold 15 times as many muffins.
360 muffins
What is 158 × 65?
10,270
A rectangle has side lengths of 62 units and 14 units.
What is the area?
868 square units
A class is going on a field trip. Twenty-three students pay $14 each and two chaperones pay $62 each.
What is the total cost?
$446
Which is a reasonable estimate for 288 × 345?
105,000
A teacher collected 32 pencils. The fourth-grade team collected 16 times as many pencils.
How many pencils did the fourth-grade team collect?
512 pencils
What is 515 × 74?
38,110
One factor is decomposed into 70 + 8 and the other into 50 + 4.
What is the product?
4,212
A school library orders new books.
24 boxes contain 15 books each, and 4 special collections contain 55 books each.
How many books were delivered in all?
580 books
There are 261 participants and each jumps 216 times. Is 40,000 a good estimate? Why or why not?
No. The actual numbers are much larger than 200 x 200. A better estimate is about 300 × 200 = 60,000.
A student solved 48 math problems during practice. During a competition, she solved 25 times as many problems.
How many problems did she solve during the competition?
1,200 problems