1.30 Deling  (Page 3/5)

 Page 3 / 5
 1.1 180 ÷ 20 = (180 ÷ 10) ÷ 2 = 18 ÷ 2 = 9 1.2 4 200 ÷ 60 = (4 200 ÷ 10) ÷ 6 = 420 ÷ 6 = 70 1.3 3 600 ÷ 400 = (3 600 ÷ 100) ÷ 4 = 36 ÷ 4 = 9 1.4 54 000 ÷ 900 = (54 000 ÷ 100) ÷ 9 = 540 ÷ 9 = 60

2. Voltooi die volgende op jou eie:

2.1 1 380 ÷ 60 = (1 380 ÷ 10) ÷ ..................

= .................. ÷ ..................

= ..................

2.2 32 840 ÷ 40 = (32 840 ÷ ..................) ÷ ..................

= ......................... ÷ ..................

= ..................

2.3 15 500 ÷ 500 = (15 500 ÷ 100) ÷ ..................

= .................. ÷ ..................

= ..................

2.4 312 300 ÷ 300 = (312 300 ÷ ..................) ÷ ..................

= ......................... ÷ ..................

= ..................

Het jy geweet?

Ons kan ook die deler in faktore opbreek:

Bv. 108 ÷ 12 = 108 ÷ 4 ÷ 3

= 27 ÷ 3

= 9

OF

108 ÷ 12 = 108 ÷ 2 ÷ 6

= 54 ÷ 6

= 9

3. Bereken nou die volgende deur die deler in faktore op te breek:

3.1 105 ÷ 21 = ...................................... 3.2 216 ÷ 24 = ......................................

= ...................................... = ......................................

= ...................................... = ......................................

3.3 432 ÷ 24 = ...................................... 3.4 126 ÷ 14 = ......................................

= ...................................... = ......................................

= ...................................... = ......................................

4. Werk saam met ’n maat. Kyk goed na die volgende en verduidelik dit dan vir twee ander maats.

4.1 184 ÷ 4 = (180 + 4) ÷ 4

= (180 ÷ 4) + (4 ÷ 4)

= 45 + 1

= 46

4.2 2 515 ÷ 5 = (2 000 + 500 + 15) ÷ 5

= (2 000 ÷ 5) + (500 ÷ 5) + (15 ÷ 5)

= 400 + 100 + 3

= 503

4.3 3 672 ÷ 12 = (3 600 ÷ 12) + (72 ÷ 12)

= 300 + 6

= 306

5. Voltooi die volgende:

5.1 3 045 ÷ 15 = (3 000 + ....................) ÷ 15

= (.................... ÷ 15) + (.................... ÷ 15)

= 200 + ....................

= ....................

5.2 2 575 ÷ 25 = (2 000 + .................... + ....................) ÷ 25

= (2 000 ÷ 25) + (.................... ÷ .............) + (............. ÷ ............)

= .................... + .................... + ....................

= ....................

5.3 Kan jy jou eie voorbeeld neerskryf?

Om hoofreken te kan doen [lu 1.9.2]

1. Kom ons toets eers weer jou hoofreken. Vind die korrekte antwoord en omsirkel dit met jou potlood. Vind so uit wie of wat hier versteek is!

1.1 96 ÷ 12

1.2 108 ÷ 9

1.3 72 ÷ 9

1.4 42 ÷ 6

1.5 54 ÷ 6

1.6 32 ÷ 8

1.7 27 ÷ 9

1.8 66 ÷ 11

1.9 81 ÷ 9

1.10 35 ÷ 7

1.11 21 ÷ 3

1.12 ____ ÷ 6 = 9

1.13 ____ ÷ 8 = 6

1.14 ____ ÷ 6 = 12

1.15 ___ ÷ 11 = 12

1.16 ____ ÷ 9 = 5

1.17 ____ ÷ 7 = 8

1.18 Halveer: 96

1.19 Halveer: 134

1.20 Halveer: 576

Kleur die prentjie netjies in sodat jou antwoorde duidelik wys.

Om te skat en te bereken deur geselekteerde bewerkings te gebruik [lu 1.8.5]

1. Ons het reeds gesels oor die waarde van skatting . Kom ons kyk weer hoe goed kan jy skat? Omsirkel die beste antwoord.

 EK SKAT a) Hoeveel 16’s is daar in 35? 2 12 20 b) Hoeveel 15’s is daar in 93? 6 16 60 c) Hoeveel 13’s is daar in 271? 2 20 200 d) Hoeveel 25’s is daar in 4 130? 27 175 750 e) Hoeveel 21’s is daar in 8 565? 4 40 400

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