Answer Checking

Question 1

Multiplication

Answer 1

Multiplicand DS (a) X Multiplier DS (b) = Ans DS (c)
c=ab

(alt 1: delete digits which = 9 when summed together. Alt 2: delete all digits divisible by 3).

Question 2

Division

Answer 2

Divisor DS (b) x Quotient DS (c) = Dividend DS (a)
a=bc

NB: Minus any Remainder from Dividend before DS

Question 3

Addition

Answer 3

1. DS Cols & DS Sum
   Or just DS whole addition digits for DS Sum.
2. DS Ans = DS Sum.