5 × 8
Hint :
(a) Multiple number 5 = 10 – 5 which is 5 less than 10, and 8 = 10 – 2, which is 2 less than 10, write (- 5) and (- 2) as in the form of deviation.
(b) Write the numbers up and down and their deviation in front of them.
(c) Product of deviation (- 5) × (- 2) = 10, would be written on right side of diagonal line.
(d) Write on left side (5 – 2) or (8 – 5) = 3.
(e) These will be only one number on the right side because in base 10, there is one zero.
(f) In the product of deviation (10) unit digit 0, on R.H.S. and add 1 on left side (in form of base 10).
(g) On L.H.S. 3 + 1 = 4.
(h) On removing slanted line, product is 40.
