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Mathematics

Decimal fractions

Educator section

Memorandum

MODULE TETS 5

1. a) 0,68

  1. 0,875
  2. 0,45 (3)

2. a) 8432,17

8432,168

8432,2 (3)

3.

23,6489
23 648,9
0,236489
236 489

(4)

4. a) 523,017 (2)

  1. 0,987 (3)
  2. 1,34 (2)

5. 180 size 12{ div } {} 2,25

80 times (4)

6. 88,5 x 28,3

2 504,55 m size 12{ {} rSub {} rSup {} } {} (4)

Leaner section

Content

Activity: “noughts and crosses” and module test

26. Let us play “Noughts and Crosses”!

You need a friend and a rectangle with decimal numbers as in the example.

You may also write your own decimal numbers in the blocks.

  • Player 1 chooses any number on the rectangle and must say what number ÷ or × by 10, 100 or 1 000 will give that number.

e.g. 2,5 : 25 ÷ 10 = 2,5 or

0,025 ´ 100 = 2,5

0,9 2,2 0,45 1,4
2,5 0,08 0,91 0,17
0,007 3,6 0,168 0,024
0,14 0,98 0,016 4,1
  • Player 2 checks with the calculator.
  • If player 1 is correct, he marks his block with a x or o.
  • Take turns until one of the players is the first one to get 4 x’s or o’s in a row. (horizontal, vertical or diagonal).

Module test

1. Write as a decimal fraction:

a) 17 25 size 12{ { {"17"} over {"25"} } } {} ..................................................

b) 7 8 size 12{ { {7} over {8} } } {} ..................................................

c) 9 20 size 12{ { {9} over {"20"} } } {} .................................................. (3)

2. Round off 8432,1679:

a) to 2 digits after the decimal comma: ..................................................

b) to the nearest 1 000th: ..................................................

c) to the nearest tenth: .................................................. (3)

3. Complete the table:

Number 236,489
÷ 10 .........................
× 100 .........................
÷ 1 000 .........................
× 1 000 .........................

(4)

4. Calculate without a calculator:

a) r = 2 000 – 1476,983

......................................................................................................

......................................................................................................

......................................................................................................

...................................................................................................... (2)

b) t = R4,70 × 0,21

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

...................................................................................................... (3)

c) u = 26,80 ÷ 20

......................................................................................................

......................................................................................................

......................................................................................................

...................................................................................................... (2)

5. How many times can a bottle with a capacity of 2,25 ℓ be filled from a 180 ℓ container?

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

...................................................................................................... (4)

6. A space shuttle travels 88,5 m per second. How far will it travel in 28,3 seconds?

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

......................................................................................................

...................................................................................................... (4)

(25)

Questions & Answers

a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
Kim
y=10×
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
is it 3×y ?
Joan Reply
J, combine like terms 7x-4y
Bridget Reply
im not good at math so would this help me
Rachael Reply
how did I we'll learn this
Noor Reply
f(x)= 2|x+5| find f(-6)
Prince Reply
f(n)= 2n + 1
Samantha Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Mathematics grade 7. OpenStax CNX. Sep 16, 2009 Download for free at http://cnx.org/content/col11075/1.1
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