Find the missing digits.
- R
- S
R819 - 13S5 = 6454(a)
In the hundreds place, 8 is more than 3.
So, there is no regrouping in the thousands place.
R - 1 = 6
R = 6 + 1
R = 7
(b)
In the ones place, 9 is more than 5.
So, there is no regrouping in the tens place.
1 - S = 5
In the tens place, 5 is more than 1.
This means that there is a regrouping done in the hundreds place so that 11 can substract a certain number to get 5.
S = 11 - 5
S = 6
Answer(s): (a) 7; (b) 6
