Exponents
Estimation
by 1-digit
by 2-digit
Word Problems
100
103 =
10x10x10=1000
100
Estimate 7 x 396
7x400 = 2,800 OR
10 x 400 = 4,000
100
12 x 8 =
96
100
24 x 12 =
288
100
Dr. Wilson works 160 hours a month. How many hours does he work in a year?
1,920
200
7 x 102=
7x10x10=700
200
Estimate: 91 x 51 =
90 x 50 = 4,500
200
72 x 6 =
432
200
47 x 23 =
1,081
200
Madison has 152 songs on her phone. Timothy has 9 times as many. How many songs does Timothy have?
1,368
300
101 x 23=
10x23=230
300
Estimate: 72 x 846 =
70 x 800 = 56,000
300
63 x 9 =
567
300
348 x 54 =
18,792
300
Mrs. Dobson went holiday shopping and bought 17 boxes of holiday cards. Each box has 175 cards. How many holiday cards will she have in all?
2,975
400
103 x 45 =
10x10x10x45=45,000
400
Kiera went to the bookstore and bought 12 books. Each book was $7.99. ABOUT how much money did she spend?
12 x 8.00 = $96.00 OR
10 x 8.00 = $80.00
400
842 x 7 =
5,894
400
There are 35 large fish tanks at the aquarium. Each tank holds 225 gallons of water. How many gallons of water would it take to fill all of the tanks?
7,875 gallons of water
400
457 x 28 =
500 x 30 = $15,000
500
874 x 102 =
874x10x10=87,400
500
Albany City School District bought 127 boxes of books. Each box had 52 books. ESTIMATE the number of books. Write an equation to model your work.
127 x 52 =
100 x 50 = b
b = 5,000
500
On a month long family vacation, Sam took 1,052 pictures. Kim took 6 times as many. How many pictures did Kim take? Write and solve an equation to find p, the number of photos.
1,052 x 6 = p
P=6,312
500
Connor biked 23 miles in one day. His goal is to bike that distance everyday for a year. If he achieves his goal, how many miles would he have biked?
8,395 miles
500
184 x 28 = b (books)
b=5,152