Which of the following represents the greatest 3-digit number expressed in terms of its prime factors?
33 × 37
43 × 39
23 × 35
43 × 21
The students of a class can be divided into groups of 2, 3, 5 or 6. What is the least number of children this class can have?
32
33
45
30
Which is the smallest 6-digit number divisible by 12, 15 and 30?
1,24,215
1,00,225
1,28,500
1,00,020
Which is the greatest number that divides 285 and 1,249, leaving remainders 9 and 7 respectively?
129
141
136
138
Which is the smallest 5-digit number divisible by 12, 18 and 30?
11,181
10,080
10,579
10,070
Which is the greatest 3-digit number exactly divisible by 9, 15 and 18?
785
890
990
900
What are the common multiples of 5 and 6 less than 90?
25 and 65
20 and 66
15 and 18
30 and 60
A number is divisible by 15. By what other numbers will that number be divisible for sure?
2, 4 and 7
3, 5 and 7
3, 5 and 9
1, 3 and 5
Which are the even numbers between 40 and 60?
42, 43, 46, 48, 50, 52, 54, 59, 60
42, 44, 46, 48, 50, 52, 54, 56, 58
41, 43, 45, 47, 51, 53, 55, 57, 59
40, 44, 46, 48, 50, 52, 54, 58, 60
Which are the odd numbers less than 20?
2, 4, 6, 8, 10, 12, 14, 16, 18, 20
1, 2, 5, 8, 10, 12, 13, 16, 19, 20
1, 3, 5, 7, 9, 11, 13, 15, 17, 19
1, 3, 5, 9, 10, 11, 13, 15, 19
