Adding using the column method, when multiple columns require regrouping

Maths

My equation is 4586 + 4815 = ... which is the best estimate to make before I calculate my answer?

My equation is 5592 + 1564 = ... which is the best estimate to make before I calculate my answer?

From the following equations, which equation requires regrouping in TWO columns?

From the following equations, which equation requires regrouping in the tens and hundreds column?

One of the digits in this column addition is missing, what is the missing digit?

Which of the following equations is the odd one out because it requires no regrouping?

Which of the following equations is the odd one out because it requires regrouping in the tens column?

My equation is 3242 + 4567 = ... which is the best estimate to make before I calculate my answer?

My equation is 6621 + 2098 = ... which is the best estimate to make before I calculate my answer?

One of the digits in this column addition is missing. What is the missing number?