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What is the sum of the first 10 prime numbers?
131
129
111
101
129
Memorize the sequence of the first 10 primes: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29. Summing these in pairs (e.g., 2+3+5=10, 7+13=20, 11+29=40, 17+23=40, 19) makes addition fast.
The first 10 prime numbers
S=тИСi=110тАЛpiтАЛ
Memorize the sequence of the first 10 primes: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29. Summing these in pairs (e.g., 2+3+5=10, 7+13=20, 11+29=40, 17+23=40, 19) makes addition fast.
Confusing 1 as a prime number (1 is neither prime nor composite) or skipping 2 (the only even prime).
List the first 10 prime numbers
A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.
2,3,5,7,11,13,17,19,23,29
Calculate the sum
Sum the listed prime numbers: 2+3+5+7+11+13+17+19+23+29
S=129
Verification
Grouping for ease: (2+3+5)+(7+13)+(11+19)+(17+23)+29=10+20+30+40+29=129.
129
B is correct because the sum of the first 10 prime numbers (2, 3, 5, 7, 11, 13, 17, 19, 23, 29) is equal to 129.
Questions regarding the sum of prime numbers often appear in exams. Remembering the sum of the first 10 primes (129) or first 5 primes (28) can save valuable time.
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