Mathematics Magazine for Grades 1-12  

Grade 2 (Issue 11/2004)

Theory:

Adding Three One-Digit Numbers

Adding three numbers (for example 5 + 8 + 7) involves two steps.

Mentally add the first two numbers. (5 + 8 = 13).

Add the other number to this sum. (13 + 7 = 20).

Calculate:

1.        (27 + 45) + 19 =

(27 + 45) + 19 = 72 + 19 = 91

2.        (91 – 67) + 28 =

Solution:

Proposed Exercises:

Calculate the followings divisions:

1.        24 4 3 =

2.        42 7 6 =

3.        64 8 2 =