What is 16/49 plus 8/21? (Answer: 104/147)

Exact Answer

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Problem: What is 16/49 plus 8/21?
Formula / Expression: 16/49 + 8/21
Final Answer: 104/147
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 49 and 21 share a common factor (GCD = 7). Finding their Least Common Multiple gives an LCD of 147 (which is smaller than their product 49 × 21 = 1029, keeping the calculation simpler).
Working: LCD(49, 21) = 147

Step 2: Convert to Equivalent Fractions with Common Denominator 147
Multiply the numerator and denominator of 16/49 by 3, and multiply the numerator and denominator of 8/21 by 7 so both fractions share the common base 147.
Working: 16 × 3/49 × 3 = 48/147 and 8 × 7/21 × 7 = 56/147

Step 3: Add the Numerators
Now add the numerators (48 + 56 = 104) and keep the common denominator 147 unchanged.
Working: 48 + 56/147 = 104/147

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 104 and 147 is 1, confirming that 104/147 cannot be reduced further—it is already in its simplest irreducible form.
Working: 104/147

Step 5: Decimal & Percentage Representation
Dividing the numerator 104 by denominator 147 produces a repeating decimal (approximately 0.707483, or 70.7483%).
Working: 104 ÷ 147 = 0.707483 (70.7483%)

Key Values:
- Simplified Fraction: 104/147
- Mixed Number Form: 104/147
- Decimal Value: 0.707483
- Percentage: 70.7483%

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Solved with FractionsCalc:
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16/49 + 8/21 = 104/147

Simplified Fraction

104/147

Mixed Number

Proper (104/147)

Decimal Value

0.707483

Percentage

70.7483%

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Step-by-Step Solution: 16/49 + 8/21

Step 1

Find the Least Common Denominator (LCD)

The denominators 49 and 21 share a common factor (GCD = 7). Finding their Least Common Multiple gives an LCD of 147 (which is smaller than their product 49 × 21 = 1029, keeping the calculation simpler).

LCD(49, 21) = 147

Step 2

Convert to Equivalent Fractions with Common Denominator 147

Multiply the numerator and denominator of 16/49 by 3, and multiply the numerator and denominator of 8/21 by 7 so both fractions share the common base 147.

16 × 3/49 × 3 = 48/147 and 8 × 7/21 × 7 = 56/147

Step 3

Add the Numerators

Now add the numerators (48 + 56 = 104) and keep the common denominator 147 unchanged.

48 + 56/147 = 104/147

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 104 and 147 is 1, confirming that 104/147 cannot be reduced further—it is already in its simplest irreducible form.

104/147

Step 5

Decimal & Percentage Representation

Dividing the numerator 104 by denominator 147 produces a repeating decimal (approximately 0.707483, or 70.7483%).

104 ÷ 147 = 0.707483 (70.7483%)

Visual Representation

The diagram below illustrates 16/49 plus 8/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`104/147`
Mixed Number Form	`104/147`
Decimal Form	`0.707483`
Percentage	`70.7483%`

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Frequently Asked Questions

What is 16/49 plus 8/21 as a fraction?

16/49 + 8/21 in simplest fraction form is 104/147.

What is 16/49 plus 8/21 as a decimal?

16/49 + 8/21 converted to a decimal is 0.707483.

What is 16/49 plus 8/21 as a percentage?

16/49 + 8/21 expressed as a percentage is 70.7483%.

Does 16/49 plus 8/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.707483...) because the denominator contains prime factors other than 2 and 5.