Multiply by 10's,100's and 1000's
Give me the values for all 3.
8 x 20
8 x 200
8 x 2,000
Answer: 160, 1,600 and 16,000
6 x 1,310
Answer:
6,000
What is the answer for this question?
3 rows, 1 ten in each row
3 rows, 3 ones in each row
Answer: 39
Using the area model, what is the partial products for 34 x 6?
How do you make the number 7 an even number without addition, subtraction, multiplication, or division?
Answer: Take out the "S"
Give the value for all 3.
5 x 70
5 x 700
5 x 7,000
Answer: 350, 3,500 and 35,000
Estimate the product
9 x 62
Answer:
540
Find 2 x 105 using arrays.
2 rows, 1 hundred in each row
2 rows, 5 ones in each row
Answer: 210
Using the area model, what would the partial products be for 3 x 185?
Answer: 300, 240 and 15
In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?
Answer: The person was born in 1990 bce.
What is the value of this problem?
8 x 7,000
Answer: 56,000
Estimate the product
9 x 4,720
Answer:
9 x 5,000 = 45,000
Find the answer for 2 x 411 by using arrays.
2 rows, 4 hundred in each row
2 rows, 1 ten in each row
2 rows, 1 one in each row
Answer: 822
Wyatt said he used partial products to write 7 x 870 = 5,600 + 49. What was Wyatt's error? Fix his work
Answer: Yes. He should have done 800 x 7 and 70 x 7. He should have gotten 5,600 + 490
How many times can you subtract the number 5 from 25
Answer: Once. After that you will be subtracting 5 from 20
What is the value of this problem?
8,000 x 6
Answer: 48,000
Find out if this answer is reasonable. Jack says that the estimated product for 5 x 1,879 is 2,573. Is he correct?
Answer: No, the estimated product would be 5 x 2,000 which is 10,000. Jacks estimated answer isn't close to 10,000
Find the answer using arrays. 3 x 316
3 rows, 3 hundreds in each row
3 rows, 1 ten in each row
3 rows, 6 ones in each row
Answer: 948
Using the Area Model, find the answer to:
3,450 x 4
Answer: 13,800
12,000 + 1,600 + 200.
If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again
Answer: 50/50
Answer: 280 + 160 = 440
Tell me if the estimated product is reasonable. Mary says that 7 x 289 will equal 2,023. Is Mary correct?
Explain
Answer: Yes. The estimated product would be 7 x 300 which would equal 2,100 which is close to 2,023
Write down all the expressions that have a value of 464.
a. 400 x 64
b. (4 x 100) + 16
c. 4 x 116
d. 4 x (400 + 60 + 4)
e. (4 x 100) + (4 x 10) + (4 x 8)
Answer: Choices C and E
4,265 x 5
Answer: 21,325
20,000 + 1,000 + 300 + 25
There is a clothing store in San Jose. The owner has devised his own method of pricing items. A vest costs $20, socks cost $25, a tie costs $15 and a blouse costs $30. Using this pattern, how much would a pair of underwear cost?
Answer: 45 dollars. The store owner is charging 5 dollars per letter in the item.