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ROUNDING ROUNDING TO THE TO THE
NEAREST NEAREST 1010
(LARGER (LARGER NUMBERS)NUMBERS)
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Decide:Which two tens is the number betweenWhich ten is it nearest to
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Rules:If it ends in numbers 1 to 4 round to the ten beforeIf it ends in numbers 6 to 9, round to the ten afterIf it ends in 5 (which is half way between two tens) always round up to the higher ten
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Example 1Round off 134It is between 130 and 140It 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 2Round off 357It is between 350 and 360It 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 3Round off 575It is between 570 and 580It 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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617Rounds to
620
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632Rounds to
630
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888Rounds to
890
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255Rounds to
260
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197Rounds 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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228Rounds to ?
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154Rounds to ?
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772Rounds to ?
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635Rounds to ?
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899Rounds to ?
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422Rounds to ?
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138Rounds to ?
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619Rounds to ?
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493Rounds 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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