Year 7 Interactive Maths - Second Edition

Addition

For example, 4 + 6 = 10

This is read as four plus six is equal to ten or simply, four plus six is ten.

Example 4

Find the sum of 8 and 7.

Solution:

8 + 7 = 15

Addition of Large Numbers

To add large numbers, list them in columns and then add only those digits that have the same place value, as illustrated below.

Example 5

Find the sum of 4078, 89, 386 and 9347.

Solution:

Note:

• 8 + 9 + 6 + 7 = 30
• The sum of the digits in the first column is 30.  So, we place 0 in the units place and carry 3 to the tens place.
• Similarly, the sum of the digits in the second column is 30.  So, we place 0 in the tens place and carry 3 to the hundreds place.

Setting Out:

Often, we set out the solution as follows.

Key Terms

addition, adding, sum, total, plus, carry