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Dino Pre-Algebra
Adventure!

Grades 4-5 • 20 Questions • All Key Concepts

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Questions: 20
Score: 0/0
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Dino Math Guide

Key Concepts to Remember — 7 Topics
🦴 1. Order of Operations
Always solve in this order: Parentheses → Multiply/Divide → Add/Subtract (left to right).
P → M/D → A/S
Q: What is 3 + 4 × 2?
A: 4 × 2 = 8 first, then 3 + 8 = 11
🌱 2. Factors, Multiples & Primes
Factor: divides evenly into a number. Multiple: a number times another. Prime: has only 2 factors (1 and itself).
LCM(4,6) = 12 | Factors of 24: 1,2,3,4,6,8,12,24
Q: Is 37 prime? Q2: LCM of 4 and 6?
A: 37 is Prime | A2: LCM = 12
🧊 3. Fractions
To add/subtract fractions: find a common denominator first. Equivalent fractions have the same value.
1/3 + 1/4 = 4/12 + 3/12 = 7/12
Q: Which equals 3/4? A) 6/9   B) 9/12
A: 9/12 (9÷12 = 3÷4)
💧 4. Decimals
Line up the decimal points when adding/subtracting. Multiply like whole numbers, then count decimal places.
0.34 + 0.70 = 1.04 | 2.5 × 4 = 10
Q: 2.5 × 4 = ?
A: 25 × 4 = 100, shift 1 decimal = 10.0
🧮 5. Ratios & Percentages
A ratio compares two quantities. A percentage is a ratio out of 100.
8:12 = 2:3 | 25% of 80 = 0.25 × 80 = 20
Q: 25% of 80 = ?
A: 80 × 0.25 = 20
🧩 6. Variables & Equations
A variable is a letter standing for an unknown. To solve, do the opposite operation to both sides.
x + 7 = 15 → x = 15 - 7 = 8
Q: If x = 5, what is 3x + 2?
A: 3(5) + 2 = 15 + 2 = 17
📐 7. Geometry, Data & Coordinates
Area = l × w | Perimeter = 2(l+w) | Mean = sum ÷ count | Quadrant IV: (+, −)
Area(9,6) = 54 | P(8,5) = 26 | Mean(4,6,8,10,12) = 8
Q: Area of rectangle 9 × 6?
A: 9 × 6 = 54

🧪 Dino Math Challenge

Question 1 of 20
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Dino Pre-Algebra Adventure — Grades 4-5

Name: _________________________    Date: _____________    Score: _____ / 20

1. Order of Operations

What is the value of 3 + 4 × 2?

A) 14    B) 11    C) 8    D) 10

2. Place Value

What is the value of the digit 7 in the number 47,382?

A) 700    B) 70    C) 7,000    D) 70,000

3. Factors

Rex the dinosaur wants to share 24 bones equally. Which number is a factor of 24?

A) 5    B) 6    C) 7    D) 9

4. LCM

What is the Least Common Multiple (LCM) of 4 and 6?

A) 4    B) 6    C) 12    D) 24

5. Prime Numbers

Is the number 37 prime or composite?

A) Prime    B) Composite    C) Neither    D) Both

6. Equivalent Fractions

Which fraction is equivalent to 3/4?

A) 6/9    B) 9/12    C) 8/10    D) 4/5

7. Adding Fractions

Dino ate 1/3 of his lunch and 1/4 of his snack. What fraction did he eat in total?

A) 2/7    B) 2/12    C) 7/12    D) 5/12

8. Subtracting Mixed Numbers

Rex had 3 and 1/2 fossils and gave away 1 and 3/4. How many are left?

A) 2 and 1/4    B) 1 and 3/4    C) 2 and 3/4    D) 1 and 1/4

9. Adding Decimals

Dino ran 0.34 miles then 0.7 miles. How far total?

A) 0.41 miles    B) 0.77 miles    C) 1.04 miles    D) 1.40 miles

10. Multiplying Decimals

A dino egg weighs 2.5 kg. How much do 4 eggs weigh?

A) 10 kg    B) 8.5 kg    C) 6.5 kg    D) 12 kg

11. Ratios

In a dinosaur herd there are 8 small and 12 large dinos. What is the ratio in simplest form?

A) 8:12    B) 2:3    C) 3:2    D) 4:6

12. Percentages

25% of 80 dinosaur fossils were found last year. How many is that?

A) 25    B) 15    C) 20    D) 30

13. Variable Expressions

If x = 5, what is the value of 3x + 2?

A) 13    B) 10    C) 20    D) 17

14. Solving Equations

Dino found x bones. After finding 7 more, he has 15. What is x?

A) 8    B) 7    C) 22    D) 6

15. Area of Rectangle

A dino nest is 9 feet long and 6 feet wide. What is its area?

A) 30 sq ft    B) 54 sq ft    C) 48 sq ft    D) 45 sq ft

16. Perimeter

A rectangular dino field is 8m long and 5m wide. What is the perimeter?

A) 40 m    B) 13 m    C) 26 m    D) 20 m

17. Mean (Average)

Dino scores: 4, 6, 8, 10, 12. What is the mean?

A) 6    B) 8    C) 10    D) 7

18. Negative Numbers

The temperature was -3°C and rose 7 degrees. What is it now?

A) -4°C    B) 10°C    C) 4°C    D) -10°C

19. Coordinate Plane

A fossil is located at point (3, -2). In which quadrant is it?

A) Quadrant I    B) Quadrant II    C) Quadrant III    D) Quadrant IV

20. Function Tables / Patterns

The rule is y = 2x + 1. When x = 6, what is y?

A) 8    B) 11    C) 13    D) 15

Answer Key & Explanations

Q1: B) 11

Order of operations: multiply first. 4 × 2 = 8, then 3 + 8 = 11.

Q2: C) 7,000

In 47,382, the digit 7 is in the thousands place, so its value is 7,000.

Q3: B) 6

24 ÷ 6 = 4 with no remainder. So 6 is a factor. 24 ÷ 5 = 4.8 (not a factor).

Q4: C) 12

Multiples of 4: 4, 8, 12... Multiples of 6: 6, 12... First common = 12.

Q5: A) Prime

37 has no divisors other than 1 and 37. It is prime.

Q6: B) 9/12

3/4 = 9/12 because 3×3=9 and 4×3=12. Both reduce to 3/4.

Q7: C) 7/12

1/3 = 4/12 and 1/4 = 3/12. Sum = 7/12.

Q8: B) 1 and 3/4

3 1/2 = 7/2 = 14/4. 1 3/4 = 7/4. Difference = 7/4 = 1 3/4.

Q9: C) 1.04

0.34 + 0.70 = 1.04. Line up decimals: 0.34 + 0.70 = 1.04.

Q10: A) 10

2.5 × 4 = 10.0. Think: 25 × 4 = 100, then 1 decimal place = 10.0.

Q11: B) 2:3

GCF(8,12) = 4. So 8:12 = 2:3.

Q12: C) 20

25% = 0.25. 80 × 0.25 = 20. Or: 80 ÷ 4 = 20.

Q13: D) 17

3(5) + 2 = 15 + 2 = 17.

Q14: A) 8

x + 7 = 15. Subtract 7 from both sides: x = 15 - 7 = 8.

Q15: B) 54

Area = length × width = 9 × 6 = 54 sq ft.

Q16: C) 26

Perimeter = 2(l + w) = 2(8 + 5) = 2(13) = 26 m.

Q17: B) 8

Sum = 4+6+8+10+12 = 40. Mean = 40 ÷ 5 = 8.

Q18: C) 4

-3 + 7 = 4. Moving 7 steps right from -3 on the number line reaches 4.

Q19: D) Quadrant IV

Quadrant IV has positive x and negative y. Point (3, -2) fits Quadrant IV.

Q20: C) 13

y = 2(6) + 1 = 12 + 1 = 13.