Primary 5 Exercise Before Assessment 3

Choose all prime numbers.

• 27

• 37

• 47

• 57

Choose all composite numbers.

• 29

• 39

• 49

• 59

Fanny picks a number card. Her number only has 2 factors. It begin with 8. What are the possibilities of Fanny's number card?

• 83

• 85

• 87

• 89

Collette said that every prime number is an odd number. Is she correct?

• Yes, she is correct.

• No, she is incorrect.

Violet said that number 1 is a prime number. Is she correct?

• Yes, she is correct because number 1 can be divided by 1 and itself.

• Yes, she is correct because number 1 has only 1 factor.

• No, she is incorrect because number 1 is a composite number.

• No, she is incorrect because number 1 is neither a prime nor a composite number.

Mrs Ima has 29 chairs. She wants to arrange the chairs into equal rows. Can she do that?

• Yes, she can arrange the chairs into 3 rows.

• Yes, she can arrange the chairs into 7 rows.

• No, she can't arrange the chairs into equal rows because 29 is a prime number.

• No, she can't arrange the chairs into equal rows because the chairs is not enough.

Choose a prime number closest to 70.

• 67

• 69

• 75

• 77

Choose all numbers divisible by 2.

• 370

• 371

• 372

• 373

Choose all numbers divisible by 4.

• 678

• 684

• 692

• 696

Choose all number divisible by 8.

• 1224

• 1256

• 1272

• 1286