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4 Subtraction

up to 20

Learning Objectives
After studying this chapter, students will be able to... Scan to learn

( know that subtraction means taking away ( do subtraction by counting backward
( subtract up to 20 on the number line ( subtract numbers vertically
( understand subtraction facts ( solve real life problems using subtraction
( explore addition-subtraction relationship

get ready!

Water helps in digestion of
food. It is recommended that
one should drink 8 to 10
Mom, why water glasses of water in a day.
is essential in
our diet?

Reyan drinks 2 glasses of water before having breakfast. How many more glasses
of water should he drink during the day if he intends to have 10 glasses of water
in a day? ..........................

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