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Published byCarter Lindsay Modified over 2 years ago

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Decide: Which two tens is the number between Which ten is it nearest to

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Rules : If it ends in numbers 1 to 4 round to the ten before If it ends in numbers 6 to 9, round to the ten after If it ends in 5 (which is half way between two tens) always round up to the higher ten

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Example 1 Round off 134 It is between 130 and 140 It ends in 4, so it rounds down to 130 (You only have to go back 4 to get to 130, but you would have to go forward 6 to get to 140)

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Example 2 Round off 357 It is between 350 and 360 It ends in 7, so it rounds up to 360 (You only have to go forward 3 to get to 360, but you would have to go back 7 to get to 350)

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Example 3 Round off 575 It is between 570 and 580 It ends in 5, so it rounds up to 580 (The rule is that when it ends in 5, it is half way between the two tens, so you always round up to the higher ten)

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617 Rounds to 620

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632 Rounds to 630

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888 Rounds to 890

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255 Rounds to 260

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197 Rounds to 200

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Now try to round off the following numbers to the nearest 10 using the rules:

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228 Rounds to ?

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154 Rounds to ?

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772 Rounds to ?

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635 Rounds to ?

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899 Rounds to ?

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422 Rounds to ?

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138 Rounds to ?

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619 Rounds to ?

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493 Rounds to ?

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(a) 221 (b) 337 (c) 414 (d) 577 (e) 698 (f) 712 (g) 889 (h) 994 (i) 155 (j) 373 (k) 865 (l) 636 (m) 366 (n) 142 (o) 571 (p) 488 (q) 539 (r) 768 (s) 585 (t) 372

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