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