Be able to use arithmetic operators in formulae including add, subtract, multiply, divide, indices

📊 20 Spreadsheets – Arithmetic Operators

Objective

Be able to use arithmetic operators in formulae, including add, subtract, multiply, divide, and indices (exponents).

Arithmetic Operators – The Basics

  • AddA1 + B1 adds the values in cells A1 and B1.
  • SubtractC1 - D1 subtracts D1 from C1.
  • ✖️ MultiplyE1 * F1 multiplies E1 by F1.
  • DivideG1 / H1 divides G1 by H1.
  • 🔢 Indices (Exponentiation)I1 ^ 2 squares the value in I1.

Using Operators in Formulae – An Analogy

Think of a spreadsheet like a recipe book. Each cell is an ingredient, and the formula is the cooking step that combines them.

For example, if A1 is the number of apples (🍎) and B1 is the number of oranges (🍊), then A1 + B1 gives you the total fruit count.

Indices (Exponentiation) – Power Up!

Indices let you raise a number to a power. It’s like a super‑power boost for your numbers.

Example: 3 ^ 4 means 3 multiplied by itself 4 times: $3^4 = 81$.

Practical Examples – Table of Formulae

Formula Description Result (if A1=5, B1=3)
A1 + B1 Add 8
A1 - B1 Subtract 2
A1 * B1 Multiply 15
A1 / B1 Divide 1.6667
A1 ^ 2 Square (index) 25

Exam Tips – Quick Checklist

  • 🔎 Check cell references – make sure you’re pointing to the right cells.
  • 🧮 Order of operations – remember PEMDAS: Parentheses, Exponents, Multiplication/Division, Addition/Subtraction.
  • 📐 Use parentheses for clarity – e.g., (A1 + B1) * C1.
  • ⚠️ Division by zero – always guard against it; use IFERROR if needed.
  • 📝 Show your work – write out the formula in the answer sheet if required.

Practice Challenge

Suppose you have the following values:

  • A1 = 12
  • B1 = 4
  • C1 = 3

Write a formula that calculates: multiply the sum of A1 and B1 by C1, then square the result.

Answer: ((A1 + B1) * C1) ^ 2$((12+4)*3)^2 = 576$.

Revision

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