Chapter 13.6 (Mathematics 5)

Arithmethic with Time. Division

Division of minutes and seconds by whole numbers

In groups of five:

  1. Write time in minutes and seconds, for example, 7 minutes 25 seconds.
  2. Multiply the time by a whole number less than 10 and bigger than 1.
    ​Write the product in minutes and seconds.
  3. Divide the product in minutes and seconds by the number you used when multiplying.
  4. Discuss the process of division of time in minutes and seconds by whole numbers.
  5. Share the results with other groups.

Example 6a

Divide 36 minutes 30 second by 6

6 3 6 minutes 3 5 seconds 6 36minutes30seconds - 36 minutes 30 seconds -3 0 minutes 3 0 seconds

Answer

36 minutes 30 second ÷ 6 = 6 minutes 5 seconds

Example 6b

Divide 58 minutes 20 seconds by 7

  1. 58 minutes ÷ 7 = 8 minutes rem 2 minutes
  2. Convert remaining minutes to seconds
    ​2 × 60 seconds = 120 seconds
  3. ​Add 20 to 120 to get 140 seconds
  4. 140 seconds ÷ 7  = 20 seconds

Answer

58 minutes 20 seconds ÷ 7 = 8 minutes 20 seconds

Exercise H

  1.   63 minutes seconds 6 1 54 minutes  42 seconds
  2. 63 minutes seconds 9 1 63 minutes  27 seconds  
  3. 613 minutes seconds 16 1 48 minutes  32 seconds
  4.   623 minutes seconds 23 1 69 minutes  46 seconds
  1.   minutes seconds 6 13 minutes  2 6 seconds
  2. minutes seconds 8 2 7 minutes  28 seconds  
  3. minutes seconds 9 17 minutes  24 seconds
  4.   minutes seconds 11 25 minutes  40 seconds
If the answer is 0, leave the gap blank.
  1. 42 minutes 24 seconds ÷ 6 =
    =  minutes  minutes
  2. 49 minutes 35 seconds ÷ 7 =
    =  minutes  seconds
  3. 20 minutes 36 seconds ÷ 12 =
    =  minutes  seconds
  4. 69 minutes 12 seconds ÷ 4 =
    =  minutes  seconds

Answer. One tank fills in  minutes  seconds.

Answer. It takes  seconds to make one mat.