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Saturday 10 December 2011

YEAR 4/ ADDITION WITHIN 100 000

BONUS CORNER
Adddition is done according to the place value.
Example: 4 310 + 534 =                   
   4 310                                        4 310
 +  534            (/)                       +5 34__     (X )
  4 844                                        9 650

YEAR 4/ UNIT 1 WHOLE NUMBERS- round off the numerals


EXERCISE:
Round off the numerals to the nearest ten, hundred and thousand.

 
Number
Ten
Hundred
Thousand
34 716



69 499



12 894



26 638



70 809



Tuesday 6 December 2011

Have a break

YEAR 4/ UNIT 1 WHOLE NUMBERS- ADDITION WITHIN 100 000

KEY NOTES

  6 548  }addens
+ 1 290  }
  7 838  } sum


  • Addition is a commutative operation.
    e.g:Any whole numbers a and b
        a + b = b + a
  • Addition is an associative operation.
   e.g:Any whole numbers a, b and c.
       ( a + b ) + c = a + ( b + c )

Saturday 3 December 2011

YEAR4/ UNIT 1 WHOLE NUMBERS-round off numbers

KEY NOTES
  • to round off to the nearest ten - look at the ones digit.
  • to round off to the nearest hundred - look at the tens digit.
  • to round off to the nearest thousand - look at the hundreds digit.
  • if the ones, tens and hundreds digit is 5 or greater,round up, otherwise round down.