MULTIPLICATION OF DENOMINATE NUMBERS

1. Arrange the units, start with the higher unit at the left end.
2. Write the multiplier in column with the smallest unit.
3. Multiply the numbers.
4. Reduce the answer to the higher denominations if necessary.
 
Ex. Chris studies his lessons everyday on the average of 2 hours 40 minutes. How long is it in 5 days?
 
Solution no. 1:
 
Step 1. Arrange the units and write the multiplier.
 
2 hrs 40 min
   x                 5
 
Step 2. Multiply starting from right.
 
40 min x 5 = 200 min
200 min = 3 hrs 20 min. So, write down 20 min and carry 3hrs.
 
3hrs
2hrs 30 min
    x               5
 
ANSWER: 13 hrs 20 min
 
Solution no. 2:
 
Step 1. Multiply.
 
2 hrs 40 min
    x                 5
10 hrs 200 min
 
Step 2. Reduce the answer to the higher term. 

200 min = 3 hrs 20 min So,
10 hrs 200 min = 13 hrs 20 min
 
ANSWER: 12 hours 30 minutes