OLSAT Practice Pack — Grade 8

Answer Key — OLSAT Grade 8

1. 1. B — The context of flooding due to heavy rainfall directly relates to the city's ability to drain water, making 'drainage' the logical choice.
2. 2. C — The relationship is "part to its whole." petal → flower, so finger → hand.
3. 3. C — Four of the five words are alike: they are cautious. impulsive does not fit that group.
4. 4. A — Four of the five figures share one property: all figures share the same fill. A is the one that does not belong (matches the shapes but not the shared fill).
5. 5. A — In this grid going across each row, the figure turns a quarter-turn clockwise and the figure alternates large and small at every step. The empty box must satisfy both its row and its column, which gives A. The others: B applies the change only once instead of twice; C repeats the figure directly above the empty box; D copies the far corner; E the right shape with the wrong fill.
6. 6. E — In the top row, the figure turns a quarter-turn clockwise and the figure doubles. Applying the same change to the bottom figure gives E. The others each make a specific mistake: A turns the figure the wrong way; B applies only one of the two changes; C applies a different rule than the top row shows; D copies the top row's result instead of transforming the bottom figure.
7. 7. E — Each step, one more shape appears each time. Continuing one more step gives E. The others: A repeats the last figure instead of stepping on; B the right figure with the wrong fill; C the right step on the wrong shape; D steps backward in the series.
8. 8. D — These are square numbers: 2², 3², … Next is 6² = 36.
9. 9. C — In every group each number is 2 more than the one before it. Applying the same rule to the last group gives 6: C.
10. 10. B — Across each row the numbers are multiplied by 2, and down each column they change by 12. The empty space must fit both its row and its column, which gives 372: B.
11. 11. B — The context of reducing energy consumption to affect the company's carbon footprint implies a reduction, making 'decrease' the correct choice.
12. 12. D — The relationship is "what it grows or turns into." egg → chick, so bud → flower.
13. 13. A — Four of the five words are alike: they are cures. disease does not fit that group.
14. 14. D — Four of the five figures share one property: all figures are the same shape AND the same fill (only the size and the dot vary). D is the one that does not belong (the same fill, but a different shape).
15. 15. E — In this grid going down the rows the figure alternates large and small, and going across the columns the fill darkens one step. The empty box must satisfy both its row and its column, which gives E. The others: A copies the far corner; B follows the column rule but not the row rule; C applies the change one time too many; D follows the row rule but not the column rule.
16. 16. E — In the top row, the figure doubles and the figure grows. Applying the same change to the bottom figure gives E. The others each make a specific mistake: A the bottom figure with no rule applied; B applies a different rule than the top row shows; C right change, wrong figure shape; D applies only one of the two changes.
17. 17. E — Each step, the figure turns a quarter-turn each time. Continuing one more step gives E. The others: A jumps two steps ahead; B the right figure with the wrong fill; C steps backward in the series; D repeats the last figure instead of stepping on.
18. 18. C — These are square numbers: 4², 5², … Next is 8² = 64.
19. 19. D — In every group the second number is the first squared, and the third is 3 more than the second. Applying the same rule to the last group gives 7: D.
20. 20. A — Across each row the numbers change by 5, and down each column they change by 10. The empty space must fit both its row and its column, which gives 28: A.