The Four Basic Operations - JSS1 Mathematics Past Questions and Answers - page 1

    145

 +  210

 ------

    355

Answer: 145 + 210 = 355

    345

 -   87

 ------

    258

Borrow from the hundreds place:

    3(4)5    ->  (3-1) = 2, 1 in tens place borrowed, becomes 10+4-7 = 7

 -   87   ->    10 - 8 = 2 and then minus 7 becomes 7

 ------

    258

Answer: 345 - 87 = 258

     48

  x   6

 ------

    288

Multiply each digit:

Units: 8 x 6 = 48 (write 8 in the units place and carry over 4 to the tens place).

Tens: 4 x 6 = 24, plus the carried over 4 = 28.

Answer: 48 x 6 = 288

     ____

  4 | 912

  4 goes into 9 two times (4 x 2 = 8, subtract from 9 to get 1):

      2__

   4 | 912

      - 8

       1

   Bring down the next digit (1):

      22_

   4 | 912

      - 8

      ----

       11

   4 goes into 11 two times (4 x 2 = 8, subtract from 11 to get 3):

      22__

   4 | 912

      - 8

      ----

       31

   Bring down the next digit (2):

      228

   4 | 912

      - 8

      ----

       112

      -112

         0

Answer: 912 ÷ 4 = 228