Estimation Station
What is a reasonable estimate for 3,478 × 6?
3,500 × 6 ≈ 21,000
What is 7 × 3,000?
21,000
28 × 46
1,288
A student reads 25 minutes a day for 20 days. What is the total amount of minutes they read?
500 minutes
Fill in the blanks:
8 × 64 = (8 × __) + (8 × __)
(8 × 60) + (8 × 4)
A smoothie costs $4. About 132 smoothies are sold. Estimate the total sales.
About $400
How many tens are in 90?
9 tens
Solve: 9 × 312
2,808
Packs of markers: $5 each.
Notebooks: $3 each.
What is the amount to buy 12 packs and 14 notebooks?
$102
(60 +42)
Solve with the area model: 7 x 50
350
Round 423 to the nearest hundred and multiply by 5 to estimate.
400 × 5 = 2,000
Find: 40 × 50
2,000
Find the partial products for 4 × 387
4 × 300 = 1,200
4 × 80 = 320
4 × 7 = 28
Adult tickets: $10
Child tickets: $6
What is the total cost for 3 adults, and 7 children?
$72
(30 + 42)
Solve: 7 x 90
630
Round 67 to 70 and 28 to 30. Estimate the product.
70 × 30 = 2,100
A cyclist rides 150 meters. His friend rides 4 times farther. How many meters does his friend ride?
600 meters
Use the area model: What is 6 × 248?
6 × 200 = 1,200
6 × 40 = 240
•6 × 8 = 48
Total = 1,488
A bakery sells cupcakes for $3 each and bakes 168 cupcakes. Estimate the total amount of money earned from selling 168 upcakes.
About $500 (using 150 × $3 = $450 or 200 × $3 = $600)
Solve with the area model: 3 x 247
3 × 200 = 600
3 × 40 = 120
3 × 7 = 21
Total = 741
Is 15,000 a reasonable estimate for 2,912 × 5? Explain.
Yes, because 2,912 ≈ 3,000, and 3,000 × 5 = 15,000
How can you decompose 93 into tens and ones to solve 8 × 93?
93 = 90 + 3
What is the final product of 5 × 129?
5×100 = 500
5×20 = 100
5×9 = 45
Total = 645
A hiker walks 240 m. A second hiker walks 5 times farther. How far did the second hiker walk?
1,200 meters
Complete an area model: 6 × 84
6 × 80 = 480
6 × 4 = 24
Total = 504