第 1 題
1 分Find the highest common factor (HCF) of 18, 42 and 72.
Key Stage 3 (KS3) · Mathematics
Factors, Multiples and Primes：練習題
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第 2 題
1 分Find the highest common factor (HCF) of 24 and 60.
第 3 題
1 分Which of the following numbers is a prime number?
第 4 題
1 分Which of the following is the lowest common multiple (LCM) of 12, 18, and 30?
第 5 題
1 分Find the least common multiple (LCM) of 15, 20 and 30.
第 6 題
2 分What is the smallest prime number greater than 20?
先自己寫一次答案，再對照解題步驟。
第 7 題
3 分Determine if 157 is a prime number.
先自己寫一次答案，再對照解題步驟。
第 8 題
6 分The prime factorization of a number is \( 2^x \cdot 3^2 \cdot 5 \). If the number is 360, find the value of \( x \) and then determine the total number of factors this number has.
先自己寫一次答案，再對照解題步驟。
第 9 題
4 分Consider the integers 84 and 126.
(a) Express each number as a product of its prime factors in index form.
(b) Find the Highest Common Factor (HCF) and Least Common Multiple (LCM) of 84 and 126.
先自己寫一次答案，再對照解題步驟。
第 10 題
4 分Consider the numbers 42 and 70.
(a) Express both numbers as products of their prime factors.
(b) Find the Highest Common Factor (HCF) of 42 and 70.
先自己寫一次答案，再對照解題步驟。
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