There are various methods to solve suitable addition operations for numbers up to 100
Siti has 6 marbles. Siti gave Amir 2 marbles. How many marbles does Siti have left?
Mathematical sentences: \(6 -2= 4\)
Count back 2 steps from 6:
6, 5, 4
The remaining number of marbles that Siti has left is 4.
We solve this subtraction problem by subtracting the number that is, which we will get.
Then, if there are numbers on the left, continue subtractiong as before.
We write the answer as below.
\(\begin {array}{rr} \space\space6\\-\quad\space\space2\\\hline \space\space4 \\\hline \end {array}\)
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