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Rounding
Objectives
To recognise when to round a number up or down.
To learn to round four digit numbers.
To be able to estimate answers to calculations, using rounding.
Resources
Abacus 4 Textbook 1 | Squared paper
Today's Lesson
Main Activity
Ask your student to recite two more times tables and to answer random questions on these.
Watch 'Rounding to the nearest 10, 100 and 1000'.
Remind your student about the significance of the number 5 when we are rounding numbers. If you are asked to round to the nearest 10, if the ones digit is 5 or more, you round up to the next 10. If the ones digit is less than 5, you round down. In a similar way, 50 or more rounds up to the nearest 100, 500 or more rounds up to the nearest 1,000. Anything less than the ‘magic’ 5 rounds down.
Turn to page 74 in Abacus 4 Textbook 1.
Ask your student to copy the number and round it up or down, following the instructions. Use the visual aid of the number line to help, if necessary.