Methods of Subtraction
Various methods of subtraction involving two three-digit numbers at St. Margaret's Academy Mathematics Department. Learn techniques like rounding up, chunking, digit-by-digit, and Nikhilam Sutra method for subtracting numbers. Practice these methods to improve your subtraction skills effectively.
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Methods of Subtraction St. Margaret s Academy Mathematics Dept.
Choose two three digit numbers and subtract the smaller from the larger
436 258 3 2 1 1 4 3 6 2 5 8 7 1 8
Choose two three digit numbers and subtract the smaller from the larger Round the smaller number up to the next hundred what have you had to add to it? Do the subtraction. Now add the same amount to the answer that you had to add to round up the smaller number. the equal addition method
436 258 1 3 6 4 2 7 1 4 3 6 2 5 8 4 3 6 3 0 0 3 1 + 8 6
Choose two three digit numbers and subtract the smaller from the larger Round the smaller number down to the nearest hundred and subtract. Now take away the original tens and units from the answer. the chunking method
436 258 4 3 6 2 5 8 4 3 6 2 0 0 3 2 6 236 50 8 = 178
Choose two three digit numbers and subtract the smaller from the larger Write the subtraction in column form. Take the smaller from the larger for all three columns separately, this gives you three digits. If the top number is smaller than the bottom number, put a minus sign in front of the digit for that column. Now add up the three digits giving them their relevant place value and using their signs. the pre-algebra digit by digit method
436 258 4 3 6 2 5 8 -2 2 -2 200 20 2 = 178
Choose two three digit numbers and subtract the smaller from the larger Write in column form. Replace the digits of the smaller number with the numbers needed to take them up to 9 (i.e. the complements to 9). When you get to the ones column, change the digit to the number needed to take it up to 10 (i.e. the complement of 10). Now add. In the answer, cross out the digit first from the left. the Nikhilam Sutra method
436 258 4 3 6 2 5 8 4 3 6 4 7 2 + 1 1 7 8
Choose two three digit numbers and subtract the smaller from the larger Write in column form. Work from right to left; take the bottom row digit from the top row digit unless the higher digit is smaller. If so, add ten to the top row digit then subtract and also add one to the bottom row digit in the next column to the left. Continue until you have finished.
Round the smaller number up to the next hundred what have you had to add to it? Do the subtraction. Now add the same amount to the answer that you had to add to round up the smaller number. the equal addition method Round the smaller number down to the nearest hundred and subtract. Now take away the original tens and units from the answer. the chunking method Write the subtraction in column form. Take the smaller from the larger for all three columns separately, this gives you three digits. If the top number is smaller than the bottom number, put a minus sign in front of the digit for that column. Now add up the three digits giving them their relevant place value and using their signs. the pre-algebra digit by digit method Write in column form. Replace the digits of the smaller number with the numbers needed to take them up to 9 (i.e. the complements to 9). When you get to the ones column, change the digit to the number needed to take it up to 10 (i.e. the complement of 10). Now add. In the answer, cross out the digit first from the left. the Nikhilam Sutra method What is the same? What is different?
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