Represent Regrouping
How many ones make a ten?
10
14+15=
29
12
When do we regroup in addition?
When there are 10 or more ones.
23+25=
48
34-21=
13
When do we regroup in subtraction?
When there are not enough ones to subtract/when the top digit in the ones place is smaller than the bottom digit.
37+46=
83
44-27=
17
What is the first step when adding two-digit numbers?
Add the digits in the ones place.
45+45=
90
73-48=
25
How can I check to see if the difference in my subtraction problem is correct?
Add the difference with the number you are subtracting. Example (37-19=18) -> 18+19=37
52+49
94-75=
19