Monday Understand estimation and approximation Round whole numbers to the nearest ten Resources Inside out mathematics Book 4, page 181 and 6 page 106 flashcards, beads, jelly bean, glass jar, currency note biscuits, books, pencils. Introduction to estimation and approximation Estimation is a way of saying a sum is nearly about a figure or find something close to the correct answer. If we write 99, we say that it is nearly or about 100. Another word for estimation is approximation. this sign means “approximately equal to”. When rounding numbers, do notice the following: a. digits that are less than 5 are rounded down, I.e replaced by zero. b. digits that are 5 or greater than 5 are rounded up. i.e 1 added to the original digit. Rounding whole Numbers to the Nearest Ten When rounding whole numbers to the nearest ten, simply round up or down the last whole number Note a. numbers like 20, 30,40,90, 100 200, 300, 800, 1000, 2000 b. numbers like 21, 22, 23, 24, are all rounded down
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