Column subtraction is a way of subtracting numbers by writing a number below another.

The process of unitising and exchanging between place values is known as regrouping.

Subtract 4-digit numbers using column subtraction

Maths

In this unit pupils will consolidate column addition with regrouping and column subtraction with exchanging to solve problems. They will use known facts and strategies to accurately and efficiently calculate and check.  In the future unit pupils will use their knowledge to calculate with decimal numbers using column addition and subtraction.

In the prior unit pupils revisited column addition with regrouping and column subtraction with exchanging to solve problems. They read Roman numerals to 100. In this unit pupils will consolidate column addition with regrouping and column subtraction with exchanging to solve problems. They will use known facts and strategies to accurately and efficiently calculate and check.

Column addition and subtraction with 4-digit numbers

Complete the sentence. We can regroup 1 thousand as ____ hundreds.

Where is regrouping needed in this column subtraction?

Sam had 4,991 tickets. She bought an airplane for 3,458 tickets. How many tickets does she have left?

Lucas had 2,392 tickets. He bought a car from the ticket shop and had 1,641 tickets left. How many tickets did the car cost?

Complete the sentence. We can regroup 1 hundred as ___ tens.

Regrouping is needed in the ones and tens. 

Starter Quiz