Donald in Mathmagic Land Practice Quiz

When you add 8 and 5, you get 13. Addition is the process of combining quantities.

15 minus 7 equals 8 because subtracting 7 from 15 leaves you with 8. This operation reinforces basic subtraction skills.

Multiplying 6 by 4 yields 24. This multiplication is essentially repeated addition.

36 divided by 6 gives 6 because 6 groups of 6 make 36. This demonstrates the concept of dividing a number into equal parts.

According to the order of operations, you must multiply before adding; 5 × 2 equals 10 and then adding 3 gives 13. This problem highlights the importance of following proper operation hierarchy.

To add fractions, you need a common denominator. With a common denominator of 4, 1/2 becomes 2/4, and adding 1/4 gives 3/4.

Both 8 and 12 are divisible by 4, which simplifies the fraction to 2/3. Simplifying fractions makes them easier to work with in further calculations.

To find 25% of 80, convert 25% to 0.25 and multiply by 80, which equals 20. This problem reinforces understanding of percentages and proportional reasoning.

Dividing both sides of the equation by 3 gives x = 6. This exercise demonstrates the method of isolating variables in a simple linear equation.

The LCM of 4 and 6 is 12 since it is the smallest number that both 4 and 6 divide into without a remainder. This concept is crucial for operations involving fractions and common denominators.

The perimeter of a rectangle is calculated using the formula 2 × (length + width), which here is 2 × (8 + 3) = 22. This problem reinforces the geometric concept of perimeter.

The area is found by multiplying the length by the width, so 5 × 4 equals 20. Understanding area calculation is fundamental in geometry.

Performing the operations from left to right, 7 - 3 equals 4 and then adding 2 gives 6. This reinforces the importance of sequential operations in arithmetic.

Dividing fractions means multiplying by the reciprocal; (2/3) divided by (4/5) is the same as (2/3) × (5/4) which equals 10/12 and simplifies to 5/6. This problem provides practice with fraction division.

The interior angles of any triangle always add up to 180°. This is a fundamental property used in many geometric proofs and problems.

Begin by applying the distributive property: 2x - 6 = 14. Adding 6 to both sides gives 2x = 20, and dividing by 2 results in x = 10.

Subtract 3 from both sides to obtain ½x = 4, then multiply both sides by 2 to isolate x, which gives x = 8. This exercise reinforces techniques for solving linear equations involving fractions.

The ratio 3:4 means that for every 3 boys, there are 4 girls. Since there are 21 boys, the multiplication factor is 21 ÷ 3 = 7, so the number of girls is 4 × 7 = 28.

First, find 2/3 of 48, which is 32, then calculate 3/4 of 32 to get 24. This problem reinforces the concept of sequential fraction multiplication with whole numbers.

Let the integers be x and x + 1; then the equation is x + (x + 1) = 37, which simplifies to 2x + 1 = 37. Solving this gives x = 18, making 18 the smaller integer.