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Wiskunde

Desimale breuke

Opvoeders afdeling

Memorandum

20.1

a) 260

b) 2 600

c) 26,7

d) 267

e) 2 670

f) 26,79

g) 267,9

h) 2 679

20.2 x10: Elke syfer skuif 1 plek na links / komma skuif 1 plek na regs.

x100: Elke syfer skuif 2 plekke na links / komma skuif 2 plekke na regs.

x1000: Elke syfer skuif 3 plekke na links / komma skuif 3 plekke na regs.

20.4

a) 54,8 548 5480
b) 3,67 36,7 367
c) 8,9 89 890
d) 165,38 1653,8 16 538
e) 282,51 2825,1 28 251

20.5.1

a) 21,522

b) 46,215

c) 1,4

d) 4,64

e) 12 250

f) 2 370,6

  • Antwoord is kleiner.

x met getal<1

20.8

a) 0,4964

b) 1,3737

c) 0,109

d) 5,53724

e) 38,57997

f) 16,78164

23.1 size 12{ div } {} 10: Komma skuif 1 plek na links

Elke syfer skuif een plek na regs

size 12{ div } {} 100: Komma skuif 2 plekke na links

Elke syfer skuif 2 plekke na regs

size 12{ div } {} 1000: Komma skuif 3 plekke na links

Elke syfer skuif 3 plekke na regs

23.3

8,21 0,729 0,6
0,864 0,6254 0,0392 8,791 0,035 0,08
74,68

Leerders afdeling

Inhoud

Aktiwiteit: vermenigvuldiging van desimale breuke [lu 1.3.4, lu 1.7.7, lu 1.9.2, lu 1.10, lu 2.3.3]

20. VERMENIGVULDIGING VAN DESIMALE BREUKE

20.1 Kom ons hersien

Do the following with the help of your calculator:

SOM ANTWOORD
Bv. 2,6 × 10 26
a) 2,6 × 100 .........................
b) 2,6 × 1 000 .........................
c) 2,67 × 10 .........................
d) 2,67 × 100 .........................
e) 2,67 × 1 000 .........................
f) 2,679 × 10 .........................
g) 2,679 × 100 .........................
h) 2,679 × 1 000 .........................

20.2 Werk in groepe van drie. Formuleer gou reëls vir die vermenigvuldiging van desimale breuke met 10, 100 en 1 000.

20.3 Onthou jy nog?

10 x 1 = 10 = 101

10 x 10 = 100 = 102

10 x 10 x 10 = 1 000 = 103

10 x 10 x 10 x 10 = 10 000 = 104

10 x 10 x 10 x 10 x 10 = 100 000 = 105

10 x 10 x 10 x 10 x 10 x 10 = 1 000 000 = 106

20.4 Voltooi die volgende tabel:

× 10 1 10 2 10 3
e.g. 3,2 32 320 3 200
a) 5,48 ..................... ..................... .....................
b) 0,367 ..................... ..................... .....................
c) 0,89 ..................... ..................... .....................
d) 16,538 ..................... ..................... .....................
e) 28,251 ..................... ..................... .....................

20.5 Nog hersiening

20.5.1 Werk saam met ’n maat. Bereken die antwoorde sonder om ’n sakrekenaar te gebruik:

a) s = 3,587 x 6

………………………………………………

………………………………………………

………………………………………………

………………………………………………

b) f = 9,243 x 5

………………………………………………

………………………………………………

………………………………………………

………………………………………………

c) p = 0,02 x 70

………………………………………………

………………………………………………

………………………………………………

………………………………………………

d) r = 0,058 x 80

………………………………………………

………………………………………………

………………………………………………

………………………………………………

e) t = 24,5 x 500

………………………………………………

………………………………………………

………………………………………………

………………………………………………

f) h = 2,634 x 900

………………………………………………

………………………………………………

………………………………………………

………………………………………………

20.5.2 Kontroleer jul antwoorde met ’n sakrekenaar.

20.6 VERMENIGVULDIGING VAN DESIMALE BREUKE MET DESIMALE BREUKE

20.6.1 Lees die volgende probleem en werk dan weer saam met ’n maat deur die verskillende oplossings:

’n Skilpad stap 0,8 km in een uur. Hoe ver sal hy in 0,6 uur stap?

Questions & Answers

calculate molarity of NaOH solution when 25.0ml of NaOH titrated with 27.2ml of 0.2m H2SO4
Gasin Reply
what's Thermochemistry
rhoda Reply
the study of the heat energy which is associated with chemical reactions
Kaddija
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Edafe Reply
explain please
Victory
First twenty elements with their valences
Martine Reply
what is chemistry
asue Reply
what is atom
asue
what is the best way to define periodic table for jamb
Damilola Reply
what is the change of matter from one state to another
Elijah Reply
what is isolation of organic compounds
IKyernum Reply
what is atomic radius
ThankGod Reply
Read Chapter 6, section 5
Dr
Read Chapter 6, section 5
Kareem
Atomic radius is the radius of the atom and is also called the orbital radius
Kareem
atomic radius is the distance between the nucleus of an atom and its valence shell
Amos
Read Chapter 6, section 5
paulino
Bohr's model of the theory atom
Ayom Reply
is there a question?
Dr
when a gas is compressed why it becomes hot?
ATOMIC
It has no oxygen then
Goldyei
read the chapter on thermochemistry...the sections on "PV" work and the First Law of Thermodynamics should help..
Dr
Which element react with water
Mukthar Reply
Mgo
Ibeh
an increase in the pressure of a gas results in the decrease of its
Valentina Reply
definition of the periodic table
Cosmos Reply
What is the lkenes
Da Reply
what were atoms composed of?
Moses Reply
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Source:  OpenStax, Wiskunde graad 7. OpenStax CNX. Oct 21, 2009 Download for free at http://cnx.org/content/col11076/1.2
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