WORK OUT #7

Mathematics for Children
Mental Computation and Number Sense Exercises
 

Recommended for Age 8-9

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Latihan matematik ini disarankan untuk digunakan oleh murid-murid sekolah rendah berumur 8 hingga 9 tahun. Semua latihan adalah menggunakan ayat bahasa Inggeris. Latihan-latihan matematik ini mengetengahkan konsep mental computation. Laman ini boleh dicetak terus untuk kegunaan guru sebagai salah satu aktiviti dalam kelas.
 
 

WARM UP
   
  Ali found 49 golf balls in the pond and 12 golf balls in the rough. How many did she find altogether?
  Try using 50 + 12 to help you work out the answer.

Complete these sentences to describe what you did:
 

49 + 12 is the same as 50 + 12 -1 = 61
   
 

WORK OUT

  1. For each of these, write an easier number sentence that will help you work out the answer.
a.

 

____ + ____ = ____

so

69 + 23 = _____

 

 b.

 

_____ + _____ = _____

so

79 + 12 = _____

 
       
c.

 

_____ + _____ = _____

so

19 + 22 = _____

 

 d.

 

_____ + _____ = _____

so

38 + 34 = _____

 
       
e.

 

_____ + _____ = _____

so

48 + 33 = _____

 

 f.

 

_____ + _____ = _____

so

58 + 25 = _____

 
       
       
 

  1. Work out each of these. Write the answer.

Place a above the number you adjusted.
  a) 39 + 23

= _____

  
       
  b) 32 + 39

= _____

  
       
  c) 16 + 28

= _____

  
       

  1. Add the numbers on the spokes to the number in the centre. Write the answer around the outside.

TIPS: 38 + 33 = 40 + 33 - 2 = 71

 

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