Excel PracticeArithmetic practice
Referenced formulas keep calculations connected when the source data changes.
What this lesson covers
Multiplication happens before addition. Parentheses make a discount or grouped calculation explicit.
3 exercises in this lesson
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Task 1 · cell E10
Multiply units by price for the first order.
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Task 2 · cell E10
Calculate revenue for the first two orders combined using C2, D2, C3, and D3.
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Task 3 · cell E10
Calculate the first order revenue after a 10% discount.
Using Arithmetic at work
The syntax is =C2*D2 · parentheses calculate first. Once it is in your hands, the work it replaces is the kind of thing that used to mean scrolling a column and hoping you did not miss a row.
This is lesson 2 of 37. It takes a few minutes, and the exercises are marked the moment you submit rather than at the end.
Where people usually slip
- Ranges drift. Pointing at three cells when the data has six is the single most common cause of a wrong total, and it is invisible because the answer still looks plausible.
- Copying breaks a reference. Relative references shift when a formula is copied. If a value should stay put, lock it with dollar signs.
- The number is right, the method is not. Typing a total by hand produces the right answer once. A formula produces it again when the data changes, which is the actual skill.
How this is marked
Each exercise is checked against the result the formula should produce, and then re-run on a different set of numbers. A hardcoded answer passes the first check and fails the second, so it is rejected. That second pass is the part that makes the practice stick.