Multiply multi-digit whole numbers and multiples of 10 using place value patterns and the distributive and associative properties.
Solve: 45 X 3 =
135
Round the factors to estimate the products.
597 X 52 = _________ X ___________=_________
A reasonable estimate for 597 X 52 is
600 X 50 = 30,000
Draw a model. Then, write the numerical expressions.
4 times the sum of 14 and 26
4 X (14+26)
Which expression or expressions is not equivalent to (16 X 29)?
A. 29 sixteens
B. 16 X (30-1)
C. (15-1) X 29
D. (10 X 29) - (6 X 29)
(15-1) X 29 and (10 X 29) - (6 X 29)
Determine if this equation is true or false.
86 ones X 90 hundreds = 86 ones X 900 tens
True. B/c 90 hundreds = 9,000 and 900 tens= 9,000.
Estimate 2,809 X 42=
A reasonable estimate is
3,000 X 40 = 120,000
Draw a model. Then, write the numerical expressions.
3 times the difference between 37.5 and 24.5
3 X (37.5-24.5)
Solve using mental math.
79 X 14 = ______ fourteens
79
Tickets to a baseball game are $20 for an adult and $15 for a student. A school buys tickets for 45 adults and 600 students. How much money will the school spend for the tickets?
$9,900
45 X 20=900
600 X 15= 9,000
9,000 + 900= 9,900
The estimated answer to a multiplication problem is 800,000. Which of the following expressions could result in this answer?
(8,146 × 12) (81,467 × 121) (8,146 × 121)
(81,477 × 1,217)
8,146 X 121
Write the numerical expressions in words. Then, solve.
(45+55) X 23
23 times the sum of 45 and 55
2,300
Define the unit in word form and complete the sequence of problems.
29 X 12= 29 ______
Think: 30 ____ - 1______=
twelves
250 × 300 =
75,000
In a single season, the New York Yankees sell an average of 42,362 tickets for each of their 81 home games. About how many tickets do they sell for an entire season of home games?
40,000 X 80 = 3,200,000 tickets
Write the numerical expressions in words. Then, solve.
(30 X 2) + (8 X 2)
The sum of 30 twos and 8 twos.
46
Solve mentally.
20 X 101=
2,020
4,400 × 400
__________ hundreds × __________ hundreds = 176 __________
4,400 × 400 = __________
1,760,000
____44_hundreds × __4__ hundreds = 176 __10,000________
4,400 × 400 = ___1,760,000__
Raphael wants to buy a new car. He needs a down payment of $3,000. If he saves $340 each month, about how many months will it take him to save the down payment?
about 10 months
340 X _____= $3,000
300 X 10= $3,000
Draw a model. Then, write the numerical expression.
The difference between 9 thirty-sevens and 8 thirty-sevens
(9 X 37 ) - (8 X 37)
Groton turns 101 years old in June. In order to celebrate, they ask each of the 23 classes to collect 101 items and make a collage. How many total items will be in the collage? Use mental math to solve.
23 X 101= (23 X 100) + (23 X 1)
=2300 + 23
=2,323