Answer:
6
Step-by-step explanation:
The HCF may be found by listing the factors of 18 and 24
factors of 18 : 1, 2, 3, 6, 9, 18
factors of 24 : 1, 2, 3, 4, 6, 8, 12, 24
The common factors are 1, 2, 3, 6
The highest common factor is 6
