Adding 456 and 789 correctly results in 1245. This is found by combining the hundreds, tens, and ones. The calculation reinforces basic addition skills.

Dividing 60 by 5 gives 12 because 5 multiplied by 12 equals 60. This basic division problem strengthens understanding of equal grouping.

Multiplying both the numerator and denominator of 1/2 by the same number (in this case 2) gives 2/4, which is equivalent to 1/2. This demonstrates an understanding of equivalent fractions.

A square has four equal sides, so multiplying the side length (5 units) by 4 yields a perimeter of 20 units. This problem reinforces the concept of perimeter in geometry.

Multiplying the number of groups (3) by the number of apples in each group (4) gives a total of 12 apples. This illustrates the concept of multiplication as repeated addition.

Multiplying 125 by 8 results in 1000, which can be quickly computed by recognizing that 125 is one-eighth of 1000. This exercise helps improve multiplication fluency.

0.75 can be written as 75/100, which simplifies to 3/4 after dividing numerator and denominator by 25. This conversion reinforces the relationship between decimals and fractions.

Subtracting 12 from 45 gives 33, and then adding 8 results in 41. This problem emphasizes the importance of performing operations in order.

The area is calculated by multiplying the length by the width: 7 times 3 equals 21 square units. This reinforces the formula for the area of a rectangle.

After eating 3 out of 8 slices, 5 slices remain, giving the fraction 5/8 of the pizza. This real-world problem applies the concept of fractions to everyday situations.

A number divisible by 5 ends in either 0 or 5. Among the options provided, only 5 is a valid ending digit for a number that is divisible by 5.

To find 2/3 of 18, multiply 18 by 2 to get 36 and then divide by 3, which results in 12. This exercise supports the understanding of multiplying fractions with whole numbers.

First determine the cost per notebook by dividing $12 by 4, which is $3 per notebook. Then multiply $3 by 7 to find that 7 notebooks cost $21.

A trapezoid is defined as a quadrilateral with exactly one pair of parallel sides. This property differentiates it from rectangles and squares, which have two pairs of parallel sides.

0.5 can be written as 5/10, which simplifies to 1/2 when divided by the common factor 5. This conversion reinforces the skill of expressing decimals as simplified fractions.

First, calculate 3/4 of 32 which is 24, then subtract 5 to get 19. This problem requires both fractional multiplication and subtraction, reinforcing multi-step problem solving.

Let the width be w; then the length is 2w. Using the perimeter formula, 2(w + 2w) = 36 leads to w = 6, so the area is 6 x 12 = 72 square units. This question combines algebra with geometry.

By the division algorithm, the number equals (7 × 8) + 3, which is 56 + 3 = 59. This problem tests the understanding of remainders in division.

Convert 30 minutes to 0.5 hours so that the total time is 2.5 hours. Multiplying 2.5 hours by 60 miles per hour results in 150 miles, illustrating time conversion and multiplication.

Three shelves are full, contributing 3 × 24 = 72 books, and two shelves are half-filled, each holding 12 books, totaling 24. Adding these together gives 72 + 24 = 96 books, requiring both multiplication and addition skills.