Step by step
The question
Question: work out √16 + √49.
√16 + √49
1 Square roots
Square roots come before plus.
Order: ( ) → x² √ → × ÷ → + −
√16 asks: which positive number times itself makes 16?
4 times 4 is 16.
4 × 4 = 16
So √16 is 4.
= 4 + √49
Square roots come before plus.
√49 asks: which positive number times itself makes 49?
7 times 7 is 49.
7 × 7 = 49
So √49 is 7.
= 4 + 7
2 Plus and minus
4 plus 7 is 11.
= 11
So the answer is 11.
Let's look back.
First: square roots.
Last: plus and minus.
Answer
= 11