Question

find cube of a number without actual multiplication, using the method of repeated addition.
number -5 (odd),10 (even )

please answer

Answer 1

-5+(-5)+............25times= -125. 10+10+10...........100times=1000.

Answer 2

Answer:

cube of 5 = 125

cube of 10 = 1000

Step-by-step explanation:

Given Numbers are 5 and 10

To find: Cube using repeated addition method

Repeated Addition method: Successive odd numbers are added . Number of odd numbers is equal to the no.

Cube of 5 using repeated addition method

= 11th odd no. + 12th odd no. + 13th odd no. + 14th odd no. + 15th odd no.  

= 21 + 23 + 25 + 27 + 29

= 125

Cube of 10 using repeated addition method

= 46th odd no. + 47th odd no. + 48th odd no. + 49th odd no. + 50th odd no. + 51th odd no. + 52nd odd no. + 53rd odd no. + 54th odd no. + 55th odd no.

= 91 + 93 + 95 + 97 + 99 + 101 + 103 + 105 + 107 + 109

= 1000