Rounding decimals
1 Showthepositionofeachnumberonthenumberline.
Usethenumberlinetoroundthesedecimalstothenearest
wholenumber.
a) 7.2
7.5
7 8
Thenearestwholenumberis
b) 14.8
14.5
14 15
Thenearestwholenumberis
c) 6.5
Thenearestwholenumberis
Explaintoapartnerhowtorounddecimalnumberstothenearest
wholenumber.
2 Usethenumberlinetoroundthesedecimalnumberstothe
nearesttenthandthenearestwholenumber.
a) 7.23
7.25
7.2 7.3
Thenearesttenthis
Thenearestwholenumberis
b) 14.56
14.55
14.5 14.6
Thenearesttenthis
Thenearestwholenumberis
c) 6.45
Thenearesttenthis
Thenearestwholenumberis
Explaintoapartnerhowtorounddecimalnumberstoone
decimalplace.
©WhiteRoseMaths2019
©WhiteRoseMaths2019
3 a) Whenroundingtothenearesttenth,how
manydigitswilltherebeafterthedecimalpoint?
b) Roundeachnumbertoonedecimalplace.
1.33 4.03
1.34 4.04
1.35 4.05
1.36 4.06
1.37 4.07
4 Roundeachnumbertothenearesttenth.
a) 4.21 d)11.86 g) 12.92
b)8.09 e) 5.67 h) 10.65
c) 4.84 f) 0.15
5 Circleeachdecimalthatroundsto6.2
6.32 6.23 6.27 6.17 6.12 6.25
Explainyourreasoning.
6 Herearetheweightsinkilogramsofsomeparcels.
3.48kg 1.42kg 10.65kg 1.03kg
a)Roundtheweightofeachparcelto1decimalplace.
kg
kg
kg
kg
b)The weight of each parcel has been rounded to the nearest 100g.
Isthistrueorfalse?
Talkaboutitwithapartner.
7 Amiristhinkingofanumber.
Roundedtothenearestwholehisnumberis5
Roundedtothenearesttenthhisnumberis4.8
WriteatleastfourdifferentnumbersthatAmircouldbethinkingof.
8 Afarmerisbuildinganewfenceforhersheepfield.
Herearethemeasurements.
Shewantstobuildafencearoundthewholefield.
Estimatehowmuchfencingyouthinkshewillneed.
Talkaboutyourestimatewithapartner.
89.56m
125.45m
