Sean sold 342 boxes of cupcakes last week and 557 boxes this week. To find the increase in sales, we subtract last week's amount from this week's, giving 557 - 342 = 215. Another method is to write the numbers as 4986 - 2354 = 2632 to find the difference between them by arranging the digits in columns and subtracting. Subtraction allows regrouping of digits when the number in the top row is less than the number below it in a column.

1. Subtraction without and with
Regrouping

2. Sean owns a bakeshop. Last week, she
sold 342 boxes of cupcakes. This week,
she was able to sell 557 boxes of
cupcakes. What was the increase in
the sale?
How are we going to solve for the
increase?

3. We can write the number sentence in
two ways.
342+n=557 557-342=n
How can we solve for n?
We use the second sentence.

4. 557-342=n
557 =
342 =
500
300
50
40
7
2
200 10 5 = 2 1 5
+
+
+
+-
+ +

5. Another way of subtracting numbers.
What is the difference between 4986
and 2354?
Subtraction sentence: 4986-2354=n
What is the difference between 4986
and 2354?

6. Let us solve it by arranging the
corresponding digits in column.
4 9 8 6
-2 3 5 4
2362
minuend
subtrahend
difference

8. Subtraction with Regrouping

9. 7634
-2759

11. How can we subtract numbers without
and with regrouping?
What is the importance of
this/subtraction to your life?

13. Thank you!