Year 5 Use rounding to answers to calculations Objectives: Add and subtract whole Mental Recall/Jottings: numbers with more than 800 + 640 = 1440 4 digits, including using 12 462 - 2300 formal written methods (columnar addition and = Use knowledge of place value to calculate mentally 900 - 500 = 400 subtraction) with increasingly larger numbers. Add and subtract Employ a range of special strategies to develop numbers mentally with confidence in calculating mentally. E.g. increasingly large numbers 2364 + 1999 = Written Methods: 900 - 500 = 400 2364 + 2000 = 4364 13484 + 2400 = and determine, in the context of a problem, Is your estimate close to the answer you have calculated? 13000 + 2000 = 15000 levels of accuracy 15000 + 884 = 15884 + 346.28 becomes: 9.076 - 3.142 becomes: Estimate: Estimate: Solve addition and 4 = 2001—1997 subtraction multi-step 9-3=6 25 + 350 = 375 problems in contexts, deciding which 1997 2000 25.356 89.1076 operations and methods 13486—5000 2001 +346.28 3. 142 5. to use and why. 13486—3000 = 10486 371.636 934 10486—2000 = 8486 1 1 484 + 400 = 884 8
Year 5 Objectives: Add and subtract whole numbers with more than 4 digits, including using formal written methods (columnar addition and subtraction) Add and subtract numbers mentally with increasingly large numbers Use rounding to answers to calculations Mental Recall/Jottings: 12 462 - 2300 Use knowledge of place value to calculate mentally with increasingly larger numbers. Employ a range of special strategies to develop confidence in calculating mentally. E.g. 2364 + 1999 = 2364 + 2000 = 4364 = Written Methods: 800 + 640 = 1440 900 - 500 = 400 900 - 500 = 400 and determine, in the context of a problem, 13484 + 2400 = 13000 + 2000 = 15000 Is your estimate close to the answer you have calculated? levels of accuracy Solve addition and subtraction multi-step problems in contexts, deciding which operations and methods to use and why. 484 + 400 = 884 15000 + 884 = 15884 4 = 2001—1997 1997 2000 13486—5000 13486—3000 = 10486 10486—2000 = 8486 2001 + 346.28 becomes: Estimate: 25 + 350 = 375 25.356 +346.28 371.636 1 1 9.076 - 3.142 becomes: Estimate: 9-3=6 89.1076 3. 142 5. 934 8
Calculations-October-20151.docx