If a problem asks for any of the following:
(i) Total
(ii) In all
(iii) How many
and some specific words are used to show an increase in the quantity, like
Extra
More
Added
Then there is a chance for addition in that problem.
For example:
In the given example, 'more' word represents an increase in the number of candies and 'in all' helps to identify that addition is to be done.
2.There are 3 marbles. 7 more marbles are being added. How many are there in total?
In the given example, 'more' word represents an increase in the number of marbles and how many in total helps to identify that addition has to be done.
If a problem asks for any of the following:
(i) How many are left
(ii) How many does he/she end with
(iii) How many more
and some specific words are used to show a decrease in the quantity like
Takes
Removes
Gives
Shares
Then there is a chance for subtraction in that problem.
For example:
In the given example, 'takes' word represents a decrease in the number of bananas and 'How many are left' helps to identify that the given problem is of subtraction.
2. Kelly has 57 tickets. She gives 15 to Nicole. How many tickets does Kelly end with?
In the given example, 'gives' word represents decrease in the number of tickets and 'How many does Kelly end with' helps to identify that the given problem is of subtraction.
For example:
In the given example, 'than' word represents comparison between two values, so there is a chance for subtraction in this problem.
"If value of single unit is given and problem asks for the value of more than one unit, then multiplication is used"
For example:
"If value of more than one unit is given and the problem asks for value of a single (each) unit, then division is to be done."
For example: