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Question
The number of chocolate blocks allotted to make roofs is 337,600. Out of these, 1,389 blocks were damaged, and thus not used. Calculate the number of blocks used.
The number of chocolate blocks allotted to make roofs is 337,600. Out of these, 1,389 blocks were damaged, and thus not used. Calculate the number of blocks used.
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Solution
The correct option is C 336,211
Allotted chocolate blocks =337,600
Damaged blocks =1,389
While subtracting two numbers, the digits at ones, tens, hundreds, thousands, and ten thousands places of a smaller number should be subtracted from the corresponding digits at ones, tens, hundreds, thousands, and ten thousands places of the larger number. 
Here we have to do regrouping.
We can’t subtract a bigger digit from a smaller digit. For this, we should regroup using the next digit.
But the digit at tens place is 0, so we can’t regroup from tens place. Thus, we regroup 6 from hundreds place. The digit at tens place becomes 10, and then we regroup it with ones. Hence, the digit at tens place becomes 9, and the digit at ones place becomes 10. Now, we can subtract. It will be: 10−9=1.
Now, subtract the digits at tens place: 9−8=1
Subtract the digits at hundreds place: 5−3=2
Subtract the digits at thousands place: 7−1=6
Subtract 3−0=3 and 3−0=3.
Thus, the total number of blocks used is 336,211.
Allotted chocolate blocks =337,600
Damaged blocks =1,389
While subtracting two numbers, the digits at ones, tens, hundreds, thousands, and ten thousands places of a smaller number should be subtracted from the corresponding digits at ones, tens, hundreds, thousands, and ten thousands places of the larger number.
Here we have to do regrouping.
We can’t subtract a bigger digit from a smaller digit. For this, we should regroup using the next digit.
But the digit at tens place is 0, so we can’t regroup from tens place. Thus, we regroup 6 from hundreds place. The digit at tens place becomes 10, and then we regroup it with ones. Hence, the digit at tens place becomes 9, and the digit at ones place becomes 10. Now, we can subtract. It will be: 10−9=1.
Now, subtract the digits at tens place: 9−8=1
Subtract the digits at hundreds place: 5−3=2
Subtract the digits at thousands place: 7−1=6
Subtract 3−0=3 and 3−0=3.
Thus, the total number of blocks used is 336,211.
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