Single digit mulitplication
What is 3 X 4 =
12
What is 3,456 rounded to the hundreds place?
3,500
Some scientist think the honey mushroom is 220 years old. Other scientist think it could be about 4 times as old. Which is the most REASONABLE estimate that other scientist think the age of the honey mushroom could be?
220 x 4 =
200 x 4 = 800
4 x 4 = 16
80 + 16 = 96 now count the zeros and add them
Answer: 9600
Sandra ran 63 miles. Philip ran 8 miles less than Sandra. How many miles did Philip run?
What order of operation must I do to find my answer?
Addition, Subtraction, Multiplication, or Division
Subtraction
What is 6 x 300 =
1800
What is 6 X 4?
24
What is 4,983 rounded to the thousands place?
5,000
Alan scores 7,895 points in the first level of a computer game. He scores 5 times as many points in the second level. Which estimate is closest to the number of points Alan scores in the second level?
7,895 rounds to 8,000
so 8,000 x 5 = 40,000
Joseph ran 3 miles around the track. After resting, Joseph ran an additional 2 miles. What is the total distance Joseph ran?
What order of operation must I use to solve this problem?
Addition, Subtraction, Multiplication, Division
Addition
Fill in the blank 8 x ______ = 32,000
4,000
What is 7 x 8?
56
What is 397 rounded to the highest place value?
400
Troy loaded 1,648 pounds of potatoes on his truck. He estimates he can carry 8,000 pounds in 4 truck loads. Is this reasonable?
1,648 rounds to 2,000
so 2,000 x 4 = 8,000
Yes this is reasonable.
Mark has $3.23, Jen has $3.23, and Sally has $3.32. How much more more does Sally have than either Mark or Jenn?
What order of operation do I need to use to answer this question?
Subtraction
What is 3 x 900 =
2700
What is 9 x 7 =
63
What is 509 rounded to the hundreds place?
500
Is this an accurate estimate?
416 rounds to 400
so 400 x 7 = 2,800
So 2,400 is not accurate or close.
Kat wants to put 5 pictures on each page of her album. There are 9 pages total. How many pages will be in the album.
What order of operation will I need to solve this problem?
Subtraction, Addition, Multiplication, or Division
Multiplication
How does the number of zeros in the product of 8 x 5,000 compare to the number of zeros in the factors.
There is one more zero in the product because 8x5=40. Then I count the number of zeros in both numbers. I add the zeros behind product. The product is 40,000.
Step 1: 8 x 5 =40
step 2: count zeros 8 x 5,000 = 3 zeros
step 3: add zeros behind the product so 40,000
What is 9 x 9 =
81
What is 9,999 rounded to the thousand place?
10,000
Miranda needs to copy some papers. She has 182 pages that she needs to copy. She needs 6 copies of each page. About how many pages will Miranda copy?
182 rounds to 200
so 200 x 6 = 1200
So Miranda needs to copy 1,200 pages.
Each row of peach trees has 37 trees. There are 16 rows. How many peach trees are there?
What order of operation would I use to solve this problem?
Subtraction, Addition, Multiplication, or Division
Multiplication
Joe's Fun and Sun rents beach chairs. The store rented 300 beach chairs each month in April and in May. The store rented 600 beach chairs each month from June through September. How many beach chairs did the store rent during the 6 months?
300 April 300 May
600 June 600 July 600 August 600 September
April and May 300 x 2 = 600
June - September 600 x 4 = 2400
Total for 6 months 600 + 2400 = 3,000