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Patterns — Chapter Test

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Q1
Continue: 3, 6, 9, 12, ___ ?
The rule is +3, so 12 + 3 = 15.
Q2
Continue: 2, 4, 8, 16, ___ ?
The rule is ×2, so 16 × 2 = 32.
Q3
Continue: 50, 45, 40, ___ ?
The rule is −5, so 40 − 5 = 35.
Q4
Which number completes the pattern 2, 4, 6, ___, 10 ?
The rule is +2, so the missing number is 8.
Q5
Continue the triangular numbers: 1, 3, 6, 10, ___ ?
Add 5 next: 10 + 5 = 15.
Q6
Continue the square numbers: 1, 4, 9, 16, ___ ?
5 × 5 = 25.
Q7
What is the rule for 5, 10, 20, 40 ?
Each number is double the one before, so the rule is ×2.
Q8
Continue: 81, 27, 9, ___ ?
The rule is ÷3, so 9 ÷ 3 = 3.
Q9
In a 3×3 magic square using 1 to 9, every line adds up to ___ ?
The magic sum is 15.
Q10
A child adds 2 chairs each day: day 1 has 2, day 2 has 4, day 3 has 6. How many on day 5?
Day 4 = 8, day 5 = 10 chairs.
Q11
Riya saves ₹5 on day 1, ₹10 on day 2, ₹15 on day 3. How much on day 5?
The rule is +₹5: day 4 = ₹20, day 5 = ₹25.
Q12
Beads repeat red, blue, green. What colour is the 7th bead?
The pattern repeats every 3, so the 7th bead is red (same as the 1st).
Q13
In a 3×3 magic square using 1 to 9, which number is in the centre?
The centre of this magic square is always 5.
Q14
Continue: 1, 1, 2, 3, 5, 8, ___ ?
Each number is the sum of the two before it: 5 + 8 = 13.
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