Calculating the mean (average) using: (1) add all values together to find the total, (2) count how many values there are, (3) divide the total by the count. Example: mean of 3, 5, 7 → total=15, count=3, mean=15÷3=5.
Where your child meets this in real life: Calculating average scores, average speed, or average cost per item
SEAGReady breaks calculate the mean into 3 steps, taught in order so each skill builds on the last.
Calculate the mean of 3-4 small numbers using the three-step procedure: add, count, divide
Calculate the mean of 5-7 values requiring careful organisation and column addition
Find a missing value in a data set when given the mean and all other values
Three free sample questions from our calculate the mean course. Every question comes with a full explanation, and hints that guide without giving the answer away.
Sean scored 3, 6, and 9 goals in his last three GAA matches. What is his mean score per match?
Answer: A. 6 goals
Step 1: Add all values: 3 + 6 + 9 = 18 Step 2: Count the values: 3 matches Step 3: Divide: 18 / 3 = 6 Sean's mean score is 6 goals per match.
Stuck? Start here: The mean is found using three steps: add, count, divide.
The temperatures in Bangor for five days were: 10, 8, 12, 14, and 6 degrees Celsius. What was the mean temperature?
Answer: A. 10 degrees
Step 1: Add all values: 10 + 8 + 12 + 14 + 6 = 50 Step 2: Count the values: 5 days Step 3: Divide: 50 / 5 = 10 The mean temperature was 10 degrees Celsius.
Stuck? Start here: Add all five temperatures together first.
The mean of 4 numbers is 5. Three of the numbers are 4, 6, and 3. What is the fourth number?
Answer: A. 7
Step 1: Find required total: mean x count = 5 x 4 = 20 Step 2: Add known values: 4 + 6 + 3 = 13 Step 3: Find missing value: 20 - 13 = 7 The fourth number is 7.
Stuck? Start here: If the mean is 5 and there are 4 numbers, what must the total be?
This is the exact interactive worked example your child sees in SEAGReady. Step through it and watch the method build up.
Aoife scored 4, 7, and 10 goals in her last three hockey matches.
What is her mean score per match?
Mean of 4, 7, 10
Step 1 of 3
Aoife scored 4, 7, and 10 goals in her last three hockey matches.
What is her mean score per match?
Aoife's mean score is 7 goals per match.
The key insight: The mean is like sharing equally - if Aoife scored the same in each match, it would be 7!
Watch out: 21 ÷ 21 = 1. You divide by the count (how many values), not by the total.
These are the misconceptions we see most often in calculate the mean, including the ones our practice questions are specifically designed to catch.
Struggling with calculate the mean? The real gap is often in one of these earlier topics.
SEAGReady finds the exact step where your child gets stuck, teaches it with worked examples like the one above, and brings it back for review so it sticks.