Just Solve It
3 x 95
285
Estimate 5 x 72
5 x 70 = 350
A rocket booster costs $158. If Danica needs to replace her car's tires with rocket boosters, how much will 4 rocket boosters cost?
158 x 4 = $632
4,000 + 500 + 20 + 7
62 x 32
1,984
Estimate 29 x 43
30 x 40 = 1200
Marlene is making 4 batches of pixie dust for her party. Each batch requires 2 cups of glitter and makes 24 jars. How many jars will Marlene have for the party?
96 jars
(extra info - 2 cups of glitter)
4 x 93 = 4 x (___ + ___)
4 x 93 = 4 x (90 + 3)
45 x 91
4,095
Estimate 3 x 4,488 by rounding 4,488 to the thousands.
Estimate 3 x 4,488 by rounding 4,488 to the hundreds.
Which estimate is better. Why?
3 x 4,000 = 12,000
3 x 4,500 = 13,500
Rounding to the hundreds is better because 4,488 is in between 4,000 and 5,000 so the estimate is closer to the actual answer.
A farmer plants lollipops in rows. He plants 36 rows of lollipops with 13 lollipop seeds in each row. How many lollipop seeds did the farmer plant?
36 x 13 = 468 lollipop seeds
Fill in the blanks to explain the mental math.
20 x 30 = (__ x 10) + (__ x 10)
20 x 30 = (__ x __) + (10 x 10)
20 x 30 = (____) x 100
20 x 30 = __________
20 x 30 = (2 x 10) + (3 x 10)
20 x 30 = (2 x 3) + (10 x 10)
20 x 30 = (6) x 100
20 x 30 = 600
541 x 6
3,246
There is a book sale at the library. The price for each book is $4. If 239 books are sold, about how much money will be made?
Is your estimate more or less than the actual amount?
4 x 200 = 800
Estimate is less because 239 was rounded down.
My school is collecting left socks for a clothing drive. There are 608 students in the school. Each student will bring in 3 left socks. How many left socks will the school collect in all?
608 x 3 = 1,824
Write the 4 multiplication expressions needed to solve 52 x 68
8 x 2
8 x 50
60 x 2
60 x 50
6 x 5,214
31,284
Zoe rounded 6 x 8,493 to 6 x 8,000. Andrew rounded the same problem to 6 x 9,000. Who will have the closer estimate? How do you know?
Zoe will have the closer estimate because 8,493 is closer to 8,000 than 9,000.
Miss Brown bought 18 sheets of scratch-and-sniff stickers. Each sheet contained 32 stickers. How many stickers did Miss Brown buy for her students?
18 x 32 = 576 stickers
Write in expanded notation:
3,248 x 8
8 x ______
8 x ______
8 x ______
8 x ______
3,248 x 8
8 x 3,000
8 x 200
8 x 40
8 x 8