To find the sum of 20 and 40, you simply add the two numbers together. In mathematical terms, you would write it as 20 + 40 = 60. This is because addition is a basic arithmetic operation that combines two or more numbers to give a total or sum.
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-- Drop 20 pennies or little stones onto a small patch of bare ground.
-- Drop 40 more pennies or little stones onto the same place.
Do it carefully, so that you don't scatter them.
-- Pick up all of the pennies or little stones and count them.
The number you have is the sum of 20 and 40.
20 + 40 = 60
the answer to 20 + 20 = 40
the sum for 20 + 40 + 70 + 80 = 210
The sum of the first 20 even numbers... is 110
20 of them