2.1.7

Method G - Partial Differences Method

Study on Seneca

Complete the interactive activities in the Seneca app to work towards your CPD certificate.

Partial Differences Method: 753 − 491

Step 1

Step 1

  • Write out the subtrahend under the minuend, lining up the digits so that the hundreds, tens and ones digits of each number are in the same columns respectively.
Step 2

Step 2

  • We could work from either right to left or left to right here.
  • Starting from the right, we subtract 1 from 3 and write the difference in the ones column. 3 − 1 = 2.
Step 3

Step 3

  • Subtract 9 from 5 and write the difference in the tens column.
  • 5 − 9 = −4.
Step 4

Step 4

  • Unlike in other methods, it’s fine to write a negative number in the bottom row.
  • Subtract 4 from 7 and write the difference in the hundreds column.
  • 7 − 4 = 3.
Step 5

Step 5

  • Now calculate the value of the difference.
  • Reading off the bottom row, we have 300 − 40 + 2.
  • 300 − 40 + 2 = 262
    • So 753 − 491 = 262
Jump to other topics
1

Course Overview

1.1

Course Structure & Commonly Asked Questions

1.1.1Introduction to the Course & Common Questions
2

Subtraction Methods

2.1

Subtraction Methods

2.1.1Method A - Decomposition Method2.1.2Method B - Equal Addition Method2.1.3Method C - Expanded Form Method2.1.4Method D - Partitioning Method2.1.5Method E - Counting-Up Method2.1.6Method F - Constant Difference Method2.1.7Method G - Partial Differences Method2.1.8Method H - Complementary Method2.1.9Method I - Nines Complement Method

Practice questions on Method G - Partial Differences Method

Can you answer these? Complete these activities in the Seneca app to progress towards your certificate.

  1. 1
    Which way do we work when using the Partial Difference Method?Multiple choice
  2. 2
    **Example question: Use the Partial Difference Method to calculate 832 &minus; 376.**<br><br>What shouls students write in the hundreds, tens and ones column?Multiple choice
Answer all questions on Method G - Partial Differences Method

Unlock your full potential with Seneca Premium

  • Unlimited access to 10,000+ open-ended exam questions

  • Mini-mock exams based on your study history

  • Unlock 800+ premium courses & e-books

Get started with Seneca Premium

Method F - Constant Difference Method

Method H - Complementary Method