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SAI INTERNATIONAL SCHOOL
CBSE CURRICULUM
Class: VI
Lesson Note 10.3
SUBJECT : Mathematics
CH: 10 -The other side of zero
SUBTOPIC: Number Line
The ‘infinite lift’ we saw above looked very much like a number line.
if we rotate it by 90°, it basically becomes a number line. It also tells us how to
complete the number ray to a number line, answering the question that we had asked
at the beginning of the chapter.
To the left of 0 are the negative numbers –1, –2, –3, … Usually we drop the ‘+’ sign on
positive numbers and simply write them as 1, 2, 3, …
Instead of traveling along the number line using a lift, we can simply imagine walking
on it. To the right is the positive (forward) direction, and to the left is the negative
(backward) direction. Smaller numbers are now
From 5 you wish to go over to 9, how far must you travel along the number line.
to the left of bigger numbers and bigger numbers are to the right of smaller numbers.
So, 2 < 5; –3 < 2; and –5 < –3.
You must travel 4 steps. That is why 5 + 4 = 9. (Remember: Starting Number +
Movement = Target Number) The corresponding subtraction statement is 9 –5 = 4.
(Remember: Target Number – Starting Number = Movement needed)
Now, from 3, if you wish to go to –2, how far must you travel?
