MENTAL ARITHMETIC: MULTIPLICATION

PROBLEMS (3)

To see the answer, pass your mouse over the colored area.
To cover the answer again, click "Refresh" ("Reload").
Do the problem yourself first!

 20. Rounding off a) Calculate in writing by distributing 2 to this difference: 3 × (600 − 2) = 1800 − 6 = 1794 b) Multiply mentally:  3 × 598 = 1794

21.   Multiply each column mentally.  Treat problems with decimal points
21.   as dollars and cents.

 6 × 99 = 594 2 × 2.95 = 5.90 7 × 11.98 = 83.86 5 × 79 = 395 3 × 4.95 = 14.85 5 × 16.96 = 84.80 3 × 89 =  267 6 × 5.98 = 35.88 7 × 24.98 =  174.86 8 × 39 =  312 5 × 7.99 =  39.95 3 × 19.95 =  59.85

Can you do these mentally, or with the least amount of writing?

22  At a political fund raising, fifty people paid \$10,000 each to have
22. dinner with the President.  How much money was raised?  \$500,000

23.  If your car gets 25 miles per gallon, how far could you go on 12
23 . gallons?  12 × 25 = 250 + 50 = 300 miles.

24.  What is the price of 4 airline tickets at \$182 each?   \$728

25.  What is the price of 6 airline tickets at \$56.98 each?  \$341.88

25.  What is the price of 60 tickets?  \$3,418.80

26  If coffee sells for \$3.95 a pound, what is the price of 4 pounds?
26.   \$15.80

26.  What is the price of 40 pounds?  \$158

27.  a)  How many days are there in 10 years?  Approximately 3,650.

27.  b)  How many days are there in 2 years?

27.   b) 2 × 365 = 600 + 120 + 10 = 730

27.  c)  How many days are there in 12 years?  3,650 + 730 = 4,380

Continue on to the next Lesson.

or

Return to the previous section.

Table of Contents

Please make a donation to keep TheMathPage online.
Even \$1 will help.

Copyright © 2017 Lawrence Spector

Questions or comments?

E-mail:  themathpage@nyc.rr.com