Square Root of 128 Simplified

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What is the square root of 128 simplified?

Answer

√128 = 8√2

128 = 64 × 2, and 64 = 8² is the largest perfect square that divides 128, so √128 = √64 × √2 = 8√2. Check: 8√2 ≈ 11.314, the same as √128 ≈ 11.314.

Simplifying √128 Step by Step

1. Prime factorization. — All Prime Factors of 128:

128 = 2 × 2 × 2 × 2 × 2 × 2 × 2 = 27

2. Pair up equal primes. Each pair is a perfect square and comes out of the root as one factor; a prime without a partner stays under the radical.

Prime factorTimes in 128Comes out of the rootStays under the root
27232

3. Take the pairs out of the root.

√128 = √((2 × 2) × (2 × 2) × (2 × 2) × 2)

= 2 × 2 × 2 × √2

= 8√2

4. Check by squaring back.

8² × 2 = 64 × 2 = 128

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This calculator writes a square root in simplest radical form: it finds the largest perfect square that divides the number, takes its root out of the radical and leaves the rest under it. For example, it can help you find out what is the square root of 128 simplified? (The answer is: 8√2). Enter a whole number (e.g. '128') and hit the 'Simplify' button.
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Simplified Square Roots Table

NumberSimplest radical formDecimal value
113√113≈ 10.63
114√114≈ 10.677
115√115≈ 10.724
1162√29≈ 10.77
1173√13≈ 10.817
118√118≈ 10.863
119√119≈ 10.909
1202√30≈ 10.954
1211111
122√122≈ 11.045
123√123≈ 11.091
1242√31≈ 11.136
1255√5≈ 11.18
1263√14≈ 11.225
127√127≈ 11.269
1288√2≈ 11.314
129√129≈ 11.358
130√130≈ 11.402
131√131≈ 11.446
1322√33≈ 11.489
133√133≈ 11.533
134√134≈ 11.576
1353√15≈ 11.619
1362√34≈ 11.662
137√137≈ 11.705
138√138≈ 11.747
139√139≈ 11.79
1402√35≈ 11.832
141√141≈ 11.874
142√142≈ 11.916

FAQ

What is the square root of 128 simplified?

√128 = 8√2

Is 128 a perfect square?

No. 128 = 64 × 2: its largest perfect square factor is 64 = 8², and the factor 2 stays under the radical, so √128 = 8√2.

What is √128 as a decimal?

√128 ≈ 11.314. The decimal never ends and never repeats, so it is always rounded; the exact value is 8√2.

What is the largest perfect square that divides 128?

64 = 8². Dividing gives 128 ÷ 64 = 2, and 2 has no square factor left, so √128 = √64 × √2 = 8√2.

See Also