Step by step
The question
Question: work out √81.
√81
1 Find the square root
√81 asks: which positive number times itself makes 81?
9 times 9 is 81.
9 × 9 = 81
So √81 is 9.
= 9
So the answer is 9.
Answer
= 9
Calculate √81
Step by step, with the reason for every step · Powers, square roots, absolute value · Foundations
Your turn
Try this one yourself, then check:
Work out √64
Show the answer
8