Which is the prime factorisation of 35280?
Step 1: Write (35280=16\times2205). Step 2: (2205=3^2\times5\times7^2), so (35280=2^4\times3^2\times5\times7^2). Step 3: Give 2205 its complete prime form.
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SubjectsMathematics
अभाज्य गुणनखंडन
In Class 10 Mathematics, under the Real Numbers chapter, Prime Factorisation teaches students to express a composite number as a product of prime numbers. Students practise identifying prime factors and writing factorisations using multiplication and exponents. This foundational skill supports the Fundamental Theorem of Arithmetic and later work with HCF and LCM.
TOPIC PRACTICE
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Step 1: Write (35280=16\times2205). Step 2: (2205=3^2\times5\times7^2), so (35280=2^4\times3^2\times5\times7^2). Step 3: Give 2205 its complete prime form.
View question detailsStep 1: (27720=8\times3465). Step 2: (8=2^3) and (3465=3^2\times5\times7\times11), so the power of 2 is 3. Step 3: Comparing gives (a=3).
View question detailsStep 1: Write (31104=128\times243). Step 2: (128=2^7) and (243=3^5), so (31104=2^7\times3^5). Step 3: Comparing with the given form gives (b=5).
View question detailsStep 1: (19600=140^2). Step 2: (140=2^2\times5\times7), so (19600=2^4\times5^2\times7^2). Step 3: Comparing gives (m=2).
View question detailsStep 1: Write (20790=54\times385). Step 2: (54=2\times3^3) and (385=5\times7\times11), so the power of 3 is 3. Step 3: Comparing gives (p=3).
View question detailsStep 1: Calculate (2^3=8) and (3^2=9). Step 2: (8\times9\times7\times11=5544). Step 3: Simplify powers first and then multiply.
View question detailsStep 1: Calculate (2^5=32) and (3^3=27). Step 2: (32\times27\times7=6048). Step 3: Find the values of higher powers separately.
View question detailsStep 1: Calculate (3^2=9), (5^2=25), and (7^2=49). Step 2: (9\times25\times49=11025). Step 3: In this square form, all exponents are 2, so multiply carefully.
View question detailsStep 1: Calculate (2^4=16) and (7^2=49). Step 2: (16\times3\times5\times49=11760). Step 3: Calculating powers first makes the work easier.
View question detailsStep 1: Calculate (2^7=128) and (3^5=243). Step 2: (128\times243=31104). Step 3: Simplifying both powers first is the correct method.
View question detailsStep 1: For a perfect square, all exponents must be even. Step 2: The powers of 2 and 7 are odd. Step 3: Multiplying by (2\times7=14) makes all exponents even.
View question detailsStep 1: In a perfect square, all exponents are even. Step 2: Only the power of 3 is odd. Step 3: Dividing by 3 makes the power 4 and the number becomes a perfect square.
View question detailsStep 1: In a perfect cube, every exponent must be a multiple of 3. Step 2: Powers 4, 2, and 1 must become 6, 3, and 3 respectively. Step 3: The multiplier is (2^2\times3\times7^2=588).
View question detailsStep 1: For a perfect cube, exponents should be multiples of 3. Step 2: Reduce 8 to 6, 5 to 3, 4 to 3, and 2 to 0 for the smallest divisor. Step 3: So the divisor is (2^2\times3^2\times5\times11^2).
View question detailsStep 1: For divisibility, every prime power of the divisor must be available in the number. Step 2: (n) has power 4 of 3, but (3^5) needs power 5. Step 3: Therefore, (n) is not divisible by (3^5).
View question detailsStep 1: For divisibility, each exponent in the divisor must be less than or equal to the corresponding exponent in the number. Step 2: (2^7), (3^2), and (5^4) are all available in (n). Step 3: Therefore, (n) must be divisible by (2^7\times3^2\times5^4).
View question detailsStep 1: To count with repetition, add the exponents. Step 2: (4+2+2+2=10). Step 3: Keep the difference between distinct prime count and repeated prime count clear.
View question detailsStep 1: While counting distinct prime factors, do not add exponents. Step 2: The prime bases are 2, 3, 11, and 13. Step 3: Therefore, the number of distinct prime factors is 4.
View question detailsStep 1: In multiplication, powers of the same prime base are added. Step 2: The power of 3 in (a) is 2 and in (b) is 4. Step 3: In (ab), the power of 3 will be (2+4=6).
View question detailsStep 1: Powers with the same base 5 are added in multiplication. Step 2: The power of 5 in (x) is 3 and in (y) is 5. Step 3: The total power will be (3+5=8).
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