Full Grade 4 test

A mixed number consists of a whole-number part and a fractional part. Only the fractional part determines how it is rounded.

1. Compare the numerator with half of the denominator.
2. If the fractional part is less than one half, keep the whole-number part unchanged.
3. If the fractional part is greater than one half, add 1 to the whole-number part.

Rule: less than one half rounds down; greater than one half rounds up.

The area of a right triangle is calculated using A = a · b / 2.

1. Multiply the area by 2: 2 · {s}.
2. Divide the result by the known leg {b}.

Other leg = 2 · {s} / {b}. Give the answer in centimetres.

Find the area of the triangle by multiplying its base by its height and dividing the product by 2.

1. Multiply the base length {a} m by the height {b} m.
2. Divide the product by 2.
3. Write the answer in square metres (m²).

Calculation: ({a} × {b}) ÷ 2.

Formula: A = (b × h) ÷ 2.

First find the stated percentage of the original number: number · percentage / 100. Then add this increase to the original number.

You can also calculate it in one step: new number = original number · (1 + percentage / 100).

The area of a right triangle is given by A = a · b / 2. When the area and one leg are known, rearrange the formula to find the other leg.

1. Multiply the area by 2: 2 · {a}.
2. Divide the result by the known leg length {b}.

Formula: unknown leg = 2 · {a} / {b}. Give the answer in centimetres.