Students apply divisibility rules and factor-pair logic across nine fill-ins: the digit sum of 84, the missing factor of 42, what a number ending in 0 is divisible by, the GCF of 28 and 42, and completing the factor pair (6, __) for 48. A reminder that the smallest factor of any number is 1 keeps definitions sharp.
Part B matches four GCF problems — pairs like 18 and 27, 20 and 50, 14 and 35, and 24 and 32 — to their answers. Sorting through these builds the quick GCF recognition fourth graders will lean on when simplifying fractions next year.
Style:
Factors and Multiples
Part A: Fill in the Blank
Write the missing word or number on each line.
1. The digit sum of 84 is 8 + 4 = 12. Since that is divisible by 3, so is 84.
2. The factors of 42 are 1, 2, 3, 6, 7, 14, 21, and 42.
3. A number is divisible by 10 if it ends in 0.
4. The GCF of 28 and 42 is 14.
5. The factor pairs of 48 are (1,48), (2,24), (3,16), (4,12), and (6,8).
6. The smallest factor of any number greater than 0 is always 1.
7. The LCM of 12 and 15 is 60.
8. 90 is divisible by 2, 3, 5, 9, and 10.
9. The number 56 has 8 factors in all.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each number pair to its GCF.
GCF of 18 and 27
→ 9
10
GCF of 20 and 50
→ 10
7
GCF of 14 and 35
→ 7
8
GCF of 24 and 32
→ 8
9
Factors and Multiples
★ Part A: Fill in the Blank
Write the missing word or number on each line.
1) The digit sum of 84 is 8 + 4 = 12. Since that is divisible by 3, so is 84.
2) The factors of 42 are 1, 2, 3, 6, 7, 14, 21, and 42.
3) A number is divisible by 10 if it ends in 0.
4) The GCF of 28 and 42 is 14.
5) The factor pairs of 48 are (1,48), (2,24), (3,16), (4,12), and (6,8).
6) The smallest factor of any number greater than 0 is always 1.
7) The LCM of 12 and 15 is 60.
8) 90 is divisible by 2, 3, 5, 9, and 10.
9) The number 56 has 8 factors in all.
★ Part B: Matching
Match each item on the left to the correct answer on the right.
1) Match each number pair to its GCF.
GCF of 18 and 27
→ 9
10
GCF of 20 and 50
→ 10
7
GCF of 14 and 35
→ 7
8
GCF of 24 and 32
→ 8
9
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10 Questions
10-15 minutes
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