الرياضيات

تدريبات الدرس السابع

تقدير ناتج الجمع

 

أقرب إلى أقرب عشرة , ثم أقدر ناتج الجمع:

5.      31                         30

     + 47                       + 50

_______                 _______

                                     80

 

6.      43                         40

     + 38                       + 40

_______                 _______

                                     80

 

7.    34                           30

     + 49                       + 50

_______                 _______

                                     80

 

8.      21                         40

     + 31                       + 30

_______                 _______

                                     70

 

9.     43                         40

     + 30                       + 30

_______                 _______

                                     70

 

10.    50                        50

     + 49                       + 30

_______                 _______

                                           80

 

نشاط: