Mathematics
Intermediate
50 mins
Teacher/Student led
+65 XP
What you need:
IWB/Projector/Large Screen

Multiplying a 3-digit Number by 1 Digit

Learn to multiply three-digit numbers by a single digit using partitioning and the grid method. Break numbers into hundreds, tens and units, multiply each part, then add the partial products together.

Teacher Class Feed

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    1 - Getting Started ~4 mins

    Illustration for Getting StartedA GAA club orders 234 club badges, and each badge costs €3. Roughly how much will the whole order cost, before we work it out exactly?

    Here is a question to get your thinking going: what is 200 × 3? What is 30 × 3? And what is 4 × 3? If we knew all three of those, would we have enough to answer the badge question?

    2 - Watch and Notice ~9 mins

    The interactive draws each number as a rectangle, then splits it into boxes you can multiply one at a time. Watch how each box fills, and predict each answer before it appears. The box answers get added to give the whole thing.

    3 - Try It Together ~8 mins

    Now we work one product through together on the board: 243 × 4. Watch the three-digit number partition into hundreds, tens and units so the rectangle splits into three boxes, then predict each partial product before we fill it in. Put your hand up when you have an answer for a box. Once all three boxes are filled, we add the parts to find the whole answer.

    Split the rectangle into three parts

    4 - Build the Grid in Your Copy ~4 mins

    COPYBOOK MOMENT

    In your maths copy, draw a three-cell grid for 243 × 4 and another for 327 × 3. Fill in each partial product in its own box, then add the three parts underneath to find the answer.

    5 - Class Challenge ~8 mins

    Today we solve these GAA and club problems together: first 123 club badges at €3 each, then €215 raised on each of four days, then 308 steps walked each day for five days, then 246 cans collected by seven classes. Each one is a step harder, and the one to watch is 308 steps, because it has a zero in the tens place.

    Multiplying in GAA contexts

    Pupil practice
    Module 2 · The Four Operations: Mental and Written Number
    Lesson 25 · Multiplying a 3-digit Number by 1 Digit
    Download Activity Book page (PDF)
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