Add 2-Digit and 3-Digit Numbers Year 3 Addition and Subtraction Learning Video Clip

Step 11: Add 2-Digit and 3-Digit Numbers Year 3 Addition and Subtraction Learning Video Clip

Ali the Animal Keeper is working in the conservation park when a mysterious package arrives! Help her to find out what’s inside using your knowledge of adding 2-digit and 3-digit numbers.

More resources for Autumn Block 2 Step 11.

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Discussion points for teachers

1. How many reports have there been in total?
Discuss how to find the answer to the question. Discuss how to set out the calculation.
736 + 77 = 813

2. Check each gauge to find out which one isn’t working.
Discuss the different calculations used on each gauge and the methods they will need to use to find out which gauges don’t work.
Thruster 3 isn’t working because the calculation given is incorrect, the answer given is 429. The correct calculations are given below:

3. What could Ali’s completed calculation be?
Discuss the different combinations which are possible using the given parameters. This question is open-ended for the children to explore.
Various answers, for example: 397 + 46 = 443

4. Arrange the digits so that they create an addition calculation with an answer of 441.
Discuss how the given parameters affect the answers. Discuss methods of finding a calculation that could fit the parameters. This question is open-ended for the children to explore.
Various answers, for example: 322 + 75 + 44 = 441.

5. Is she correct?
Discuss how to work out if Ali is correct.
She is incorrect. The digits need to be in the correct columns but can be moved within the column.

Optional discussion points:
Does adding 2-digit numbers to a 3-digit number always affect more columns than adding a 1-digit number? Why? If there are 10 ones in a calculation, what can we do to make the calculation easier?

National Curriculum Objectives

Mathematics Year 3: (3N3) Recognise the place value of each digit in a three-digit number (hundreds, tens, ones)

Mathematics Year 3: (3C1) Add and subtract numbers mentally, including three-digit number and tens

Mathematics Year 3: (3C2) Add and subtract numbers with up to three digits, using formal written methods of columnar addition and subtraction

Mathematics Year 3: (3C4) Solve problems, including missing number problems, using number facts, place value, and more complex addition and subtraction

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