Mental strategies for Multi Digit whole number Multiplication
4 x 3
12
12 x 4
48
First estimate, then solve. Use the standard algorithm.
1.5x 5
7.5
How much is 12 inches in feet?
1 feet.
14 x 10
140
45 x 32=
1,728
Estimate then solve. Using the standard algorithm.
53 X 1.2=
63.6
How many is 28 days in weeks?
4 weeks.
214 x 100
21400
314 x 597
187,458
First estimate then solve. Using the standard algorithm.
214 x 6.7=
1433.8
Complete the problem, step one is set up for you. You may use fractions or decimals.
4,500 grams=____kilograms
4,500 grams=4,500 x ( 1 gram)
=4,500 X ( kilogram)
=____________
4,500 grams=4,500 x ( 1 gram)
=4,500 X ( 0.001 kilograms)
=__4.5 Kilograms __________
Without calculating, compare the values using <, >, or =. Draw a model if it helps you.
(5 + 12) x 19 91 x (5 + 12)
and
The difference between 18 sevens and 6 sevens
The sum of 8 sevens and 4 sevens
Explain how you compared the expressions without calculating.
(5 x 12) x 19 < 91 X (5 + 12 )
the difference between 18 sevens and 6 sevens > The sum of 8 sevens and 4 sevens
Using the standard algorithm solve 351 x 602=
211,302
Estimate the product by filling in the blanks.
6.3 x 32 ≈ ________ x 30
________ x 30 = __________
Solve using an area model or a strategy based on place value. Enter the product in the box. Enter only numbers in the box.
6.3 x 32=
201.6
Kendra and Heily ran a race last week. Kendra ran 5 kilometers and Heily ran twice as far as Kendra. What is the total distance that Kendra and Heily ran in the race? Express your answer in meters.
The total distance that Kendra and Heily ran last week is ________ meters.
The total distance in kilometers was 15.
The total distance that Kendra and Heily ran last week is ___15000_____ meters.
Read the expression and write your answers.
Product
32 x 4
32 x 40
320 x 40
320 x 400
32 X 4= 128
32 X 40= 1280
320 X 40= 12800
320 X 400 = 128000
USE THE GOOGLE DOCUMENT #2
Answers
Words and value
16 times the sum of 9 and 2, 176
18 multiplied by the difference of 98 and 75, 414
The difference between 10 twos and 4 threes, 8
Adriana solved the problem incorrectly 4.3x21= looking at the area model, what did Adriana do incorrectly? Choose two of the options!
LOOK AT REVIEW DOCUMENT, #6
1.Adriana set up the model incorrectly.
2. Adriana incorrectly wrote 883 tenths in standard form
3.Adriana’s partial products are not all correct
4.Adriaba added the partial products incorrectly
3.Adriana's partial products are not all correct
4. Adriana added the partial products incorrectly.
Brayan and Joshua are working together to beat a level of their new video game. Last week, Brayan played the game for 8 hours. Tabitha played for twice as long as Joshua. What is the total amount of time they tried to beat the new level of the video game? Express your answer in minutes.
The total amount of time they played to beat the game was 24 hours.
24 hours in seconds is 1,440 seconds.