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What’s the error? Topic 1 Quadrilaterals Topic 2 Displaying Data Topic 3 Fractions, Decimals and Percentages What’s the error? Topic 1 Quadrilaterals Each of the following sentences contains a mistake. Discover the type of mistake – a mathematical error or a spelling error? Tick the box. Question 1. A rectangle has four acute angles. 2. A trapezium is an example of a quadlirateral. 3. Every square is a recttangle. 4. The formula for the area of a 1 parallelogram is 2 × base × height. 5. The lengths of the diagonals of a kite are always equal. 6. The sum of the interior angles of any quadrilateral is 180°. 7. A paralelogram has 2 pairs of parallel sides. 8. A square has 2 lines of symmetry. 9. The area of a rectangle with length 6cm and breadth 2m is 12cm². 10. The diagonals of a kite cross at right angles outside the shape. Mathematical error Spelling error What’s the error? Topic 2 Displaying Data Each of the following sentences contains a mistake. Discover the type of mistake – a mathematical error or a spelling error? Tick the box. Question 1. A frequency diagram is a type of pie chart. 2. A key must be included when drawing any pictagram. 3. Usually, the vertical axis is the 𝑥 – axis. 4. The scatter diagram above shows negative correlation. 5. In a bar chart for qualitative data, there must be gaps beetween the bars. 6. When drawing a pie chart, it is important to remember that the sum of the angles in the centre of the circle is 180°. 7. When drawing any histogram, the formula for finding the frequency density is: Frequency Density = Class Width ÷ Frequency. 8. The word “cumulative” (as seen in “Cumulative Frequency Diagram”) refers to a type of multiplication. 9. It is important to rememmber to add a title to any chart or diagram. 10. When drawing any chart or diagram, you must always use the same scale (e.g. 1 big square of graph paper = 10 units) on the horizontal and vertical axes. Mathematical error Spelling error What’s the error? Topic 3 Fractions, Decimals & Percentages Each of the following sentences contains a mistake. Discover the type of mistake – a mathematical error or a spelling error? Tick the box. Mathematical error Question 1. As a decimal, 46% is equal to 4.6. 2. In any fraction, the denominator is the number at the top of the fraction and the numerator is the number at the bottom of the fraction. 3. To multiply two fractions, we need to multiply the numerators and multiply the denominators, then simplify if posible. 4. To add two fractions, we need to add the numerators and add the denominators, then simplify if possible. 5. Three quarters of an hour is equal to 0.45 hours. 4 6. The fraction 5 is equal to the decimal 0.4. 7. 20 out of 25 in an exam gives the percentage 75%. 3 8. The mixed number 4 5 is equivelent to the top-heavy fraction 23 . 5 9. When adding seven hundredths to eight thousandths we get the answer 0.78. 9 10. The numbers 46% , 20 , 0.43 are written in ascending order. Spelling error