ReasoningAbility.com

Number Analogy - Expert Level: sum-product patterns EXPERT

Strategic basic drills ★ for number analogy: 20 expert-level problems. Worksheet 29 of 30 - Focus: sum-product patterns. Develop expertise in numerical relationships, square-cube patterns, prime numbers with step-by-step solutions. Ideal for expert-level learners targeting challenging problems and time-bound practice.

📝 Worksheet 29 of 30 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Expert level

What you'll learn in this worksheet:
Your progress through Number Analogy
Worksheet 29 of 30 (96% complete)

Question 1

Find the missing number: 21 : 18 :: 23 : ?
The subtractor alternates: -3 then -2. So 23 - 2 = 21
subtraction, basic

Question 2

Find the missing number: 11 : 13 :: 11 : ?
The relationship is adding 2. So 11 + 2 = 13, and 11 + 2 = 13
addition, basic

Question 3

Find the missing number: 10 : 15 :: 20 : ?
The relationship follows an alternating addition pattern: +5, then +6. So 20 + 6 = 26
addition, basic

Question 4

Find the missing number: 124 : 8 :: 235 : ?
The relationship is the product of digits. Product of digits of 124 = 8, product of digits of 235 = 30
product, digits

Question 5

Find the missing number: 74 : 2 :: 93 : ?
The relationship is the digital root (repeated sum until single digit). Digital root of 74 = 2, of 93 = 3
digit, sum

Question 6

Find the missing number: 43 : 77 :: 21 : ?
The relationship is the sum of number and its reverse. 21 + 12 = 33
reverse, digits

Question 7

Find the missing number: 7 : 64 :: 5 : ?
The relationship is the next consecutive square. (5+1)² = 36
square, roots

Question 8

Find the missing number: 74 : 121 :: 56 : ?
The relationship is the sum of number and its reverse. 56 + 65 = 121
reverse, digits

Question 9

Find the missing number: 39 : 93 :: 36 : ?
The relationship is reversing the digits. Reverse of 39 is 93, reverse of 36 is 63
reverse, digits

Question 10

Find the missing number: 2 : 4 :: 4 : ?
The relationship is squaring the number. So 2² = 4, and 4² = 16
square, power

Question 11

Find the missing number: 10 : 100 :: 9 : ?
The relationship is squaring the number. So 10² = 100, and 9² = 81
square, power

Question 12

Find the missing number: 3 : 27 :: 4 : ?
The relationship is cubing the number. So 3³ = 27, and 4³ = 64
square, power

Question 13

Find the missing number: 85 : 45 :: 84 : ?
The relationship is the difference between number and product of its digits. |84 - 32| = 52
product, digits

Question 14

Find the missing number: 19 : 17 :: 29 : ?
The relationship is the previous prime number. Previous prime before 29 is 23
prime, advanced

Question 15

Find the missing number: 2 : 3 :: 11 : ?
The relationship is the next prime number. Next prime after 11 is 13
prime, advanced

Question 16

Find the missing number: 4 : 16 :: 5 : ?
The relationship is squaring the number. So 4² = 16, and 5² = 25
multiplication, basic

Question 17

Find the missing number: 96 : 27 :: 91 : ?
The relationship is the difference between number and its reverse. |91 - 19| = 72
reverse, digits

Question 18

Find the missing number: 63 : 99 :: 45 : ?
The relationship is the sum of number and its reverse. 45 + 54 = 99
reverse, digits

Question 19

Find the missing number: 1, 1, 3 : 5 :: 1, 3, 2 : ?
Tribonacci pattern: each term is sum of previous three. 1+3+2 = 6
pattern, sequence

Question 20

Find the missing number: 2, 2, 2 : 6 :: 1, 1, 4 : ?
Tribonacci pattern: each term is sum of previous three. 1+1+4 = 6
pattern, sequence
Previous Worksheet Next Worksheet