Unit 1 · Patterns and Sequences
2×P − 4 = 36 — What Comes Before 36?
Lesson 5 of 6
About this lesson
A sequence rule says each number is 4 less than double the previous. Jasper needs the number directly BEFORE 36, then adds its digits. The two-step trap: you must reverse the rule (work backwards from 36), not apply it forward. Option E (14) is what you get if you apply the rule forward to 36 — a classic direction error.
Chapters
Question
In a sequence, each number is 4 less than double the previous number.
Jasper finds the number directly before 36 in the sequence.
His answer has two digits. He adds these two digits to get a new number.
What is the new number?
Take your OC prep further
- Sample questions & worked solutions across core OC topics
- Digital exam simulator with interactive practice sets
- Personalised progress tracking across all your devices
Already have an account? Log in here
No payment required. Compare OC plans
Give Your Child the Best Chance at OC Entry
Join NSW families preparing their children for the Opportunity Class Placement Test with the most realistic online OC practice tests available. First tests free—no credit card required.
Claim Your Free OC Practice Tests