Addition without regrouping

Taking numbers apart

Putting numbers together

Multiplying numbers

Dividing numbers

6

7

8

9

65

75

85

74

36

38

39

40

Yes

No

To split digits and place them in different columns.

To make numbers smaller for easier calculation.

To combine single-digit numbers into a double-digit number.

To always carry over a '1' to the next column.

When the sum of the tens column is a double-digit number.

When the sum of the ones column is a double-digit number.

When both the ones and tens columns result in single-digit sums.

Regrouping is always necessary in double-digit addition.

No, because 2 + 9 is a single-digit number.

Yes, because 2 + 9 results in a double-digit number.

No, because the sum of the tens column is less than 10.

Yes, because both numbers are double-digit.

Yes, because 5 + 2 is a double-digit number.

No, because 6 + 2 results in a single-digit number.

Yes, because both numbers are double-digit.

No, because the sum of the tens column is less than 10.