Is it Reasonable?
Estimate the Product
4 x 279
4 x 300 - 1,200
79 x 3
237
651 x 6
3,906
3,721 x 7
26,047
Write the number in expanded form:
53,826
50,000 + 3,000 + 800 + 20 + 6
Estimate the Product
8 x 89
8 x 90 = 720
59 x 6
354
895 x 9
8,055
8 x 1,276
10,208
387,969 + 562,031
950,000
Estimate the Product
3 x 1,675
3 x 2,000 = 6,000
47 x 3
141
298 x 5
1,490
7,956 x 8
63,648
Round this number to the hundreds place.
61,294
61,300
Is this Reasonable?
8 x 578 = 4,624
8 x 600 = 4,800
These numbers are close, so it is reasonable.
A parking garage has 8 levels. Each level has parking spaces for 78 cars. How many cars can park in the garage at one time?
8 x 78 = 624
148 tables are set up in a large hall. Each table can seat 8 people. How many people can sit at all the tables?
148 x 8 = 1,184
Over a weekend, 2,719 tickets were sold for a concert. Each ticket was $5. How much money did the concert make in ticket sales?
2,719 x $5 = $13,595
67,451 - 29,609
37,842
John read 529 pages in a week for a reading competition. He says he will read 41,639 pages in 8 weeks. Is this reasonable or not and why?
529 x 8 estimates to 500 x 8
500 x 8 = 4000, which is NOT close to 41,639
This is not reasonable
Mia mows 14 lawns on Saturday and 9 lawns on Sunday. She gets paid $8 per lawn. How much money would Mia get paid?
14 + 9 = 23 lawns
23 x $8 = $184
Dinali's Bakery bakes 108 cookies and 96 muffins every hour. How many goodies are baked in 9 hours?
108 + 96 = 204
204 x 9 = 1,836 goodies
A bookstore ordered 1,528 packs of pens and 1,823 packs of pencils. Each pack cost $3. How much did the school spend?
1,528 + 1,823 = 3,351 packs
3,351 x $3 = $10,053
How would you compare the value of the 6's in the following two numbers?
46,710 60,284
The 6 in 60,284 is ten times the value of the 6 in 46,710.