decimal and directed numbers

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MUHYIDDIN SCHOOL
GRADE 7 / MATHEMATICS
UNIT TEST ON DECIMALS AND DIRECTED NUMBERS/2010

Name: Index: Class:

Answer all the questions
Show all the working on this paper


1. Give the place value of 8 in each of the following. (1 mark)

a) 8752.36 __________________________

b) 24.786 __________________________


2. Write the following decimals in ascending order. (1mark)

6.006 , 0.6 , 6.6 , 0.006 , 66.6 , 0.0006




3. Round off the following to the place given in the bracket. (6× 0.5=3 marks)

a) 257( tens) b) 8234( hundreds)



c) 23697( thousands) d) 78523( ten thousands)



e) 72.543( hundredths) f) 0.007877( 3 d.p.)




4) simplify the following. ( 2 marks)

a) 8.23 × 10000 b) 25.1 ÷ 100



5) Compare the following pairs of directed numbers using < or > ( 1 marks )


a) –14 + 3


b) – 89 – 16


6) Use number line to add the following. ( 1 marks )





(– 3 ) + ( + 6 )



7) Simplify the following

a) (- 3024 ) + ( -299 ) b) ( +222 ) – ( + 17 ) (4×2=8 marks)







c) - 23 – 541 + 36 d) ( - 45) × ( - 6)







8) In an island in Africa, the temperature at midnight was – 7 ° c. Next day at noon it was increased by 28° c. What was the temperature at noon? (1 mark)







9) A container had 239.72 liters of water and 78.6 liters were added. Umar used

29.5 liters of water. How much water is left? (2 marks)










10) Ali went to a stationary shop. He bought 7 pens at Rf 13.45 each and 5 pencils at

Rf 3.75 each and a pencil-case for Rf 25.25 ( 2+1=3 marks)

a) How much did he spend?







b) If he gives the shopkeeper a 500 note. How much change did he get back?








11) Evaluate and give your answer correct to 1 decimal place. (2 marks)

2.325 ÷ 1.7