EdPlace PDF worksheet example

Maths WorksheetCheck the order of magnitude by roundingRef: MY7W2356 Maths Worksheet Check the order of magnitude by rounding This worksheet uses a simple practice to test a child’s understanding of rounding. The worksheet also uses mental arithmetic and calculator skills to derive answers. Key Information Topic Rounding Level (1-3) Questions 10 Key Stage 3 Year 7 Curriculum Coverage Number and the number system Curriculum Skill Written and calculator methodsNameDate© EdPlace Limited 2011 Page 1 of 3

QUESTIONS Maths WorksheetCheck the order of magnitude by roundingRef: MY7W2356 Here’s an example of checking the order of magnitude by rounding. 7840 × 28 is approximately 8000 × 30 or 240000 24216 - 18947 is approximately 24000 - 19000 or 5000 542 ÷ 18 is approximately 500 ÷ 20 or 25 3.42 × 19 lies between 3 × 19 and 4 × 19 or between 57 and 76. Work out approximate answers to the following problems in the same way. Write down the approximations you use. Check to see how close you are by doing the calculation on your calculator. Question 1 8.64 x 28 lies between [Answer 1] and [Answer 2] or [Answer 3] and [Answer 4] Using a calculator, 8.64 x 28 = [Answer 5] Your answers Answer 1 Answer 3 Answer 5 Answer 2 Answer 4 Question 2 4.34 x 22 lies between [Answer 1] and [Answer 2] or [Answer 3] and [Answer 4] Using a calculator, 4.34 x 22 = [Answer 5] Your answers Answer 1 Answer 3 Answer 5 Answer 2 Answer 4© EdPlace Limited 2011 Page 2 of 3

ANSWERS Maths WorksheetCheck the order of magnitude by roundingRef: MY7W2356 Answer 1 Correct answers Answer 1 8 x 28 Answer 3 224 Answer 5 241.92 Answer 2 9 x 28 Answer 4 252 Answer Explanation Start by rounding down. Then round up. Use your calculator to multiply the 2 numbers. This correct answer should lie between the numbers you round down and up. Answer 2 Correct answers Answer 1 4 x 22 Answer 3 88 Answer 5 95.48 Answer 2 5 x 22 Answer 4 110 Answer Explanation Start by rounding down. Then round up. Use your calculator to multiply the 2 numbers. This correct answer should lie between the numbers you round down and up. Total score: /10© EdPlace Limited 2011 Page 3 of 3

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EdPlace PDF worksheet example

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