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The student finds the difference between two numbers given in any order, and checks a subtraction by adding back.
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Whichever order they are named in, the smaller comes off the greater.
The difference between two numbers simply means how far apart they are. Because distance can't be negative in basic subtraction, the smaller number always comes off the greater number, no matter which one is named first.
Worksheet 5 question 2(c), where the numbers are named the wrong way round.
Problem. Find the difference between and .
Three items from Worksheet 5 question 2, plus question 4.
Find the difference between:
(a) and
(d) and
(f) and
(g) The largest number of five digits and the smallest number of three digits.
Provide the final difference for all four items.
Explain the rule you used to decide which number goes on top before subtracting.
Add the subtrahend to the difference and you should get the minuend.
To check your difference, simply add the subtrahend (the number you subtracted) and the difference (your answer) together. This sum should be exactly equal to the minuend (the top number you started with).
Worksheet 5 question 3(c), done and then verified.
Problem. Perform the subtraction and check the answer.
Three items from Worksheet 5 question 3, each with its check.
Perform the subtraction for each item below. Then, explicitly write out the addition check for each.
(a)
(e)
(f)
Enter the final difference for all three problems.
Show the addition statement you used to check each answer.