Step 4: Add two 4-Digit Numbers 3 Year 4 Addition and Subtraction Learning Video Clip
Sebastian the explorer has been travelling deeper and deeper into the jungle hoping to make new discoveries for his research. He needs to use his knowledge of adding two 4-digit numbers to escape from a deep ravine.
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Discussion points for teachers
- Calculate the total so that he knows how far he needs to climb up. Discuss use of exchanging in different columns.
4,639 + 1,587 = 6,226
- What must his calculation be? Discuss which numbers create which totals to work out where each digit should go. Discuss effect of exchanging.
2,917 + 6,354 = 9,271
- Which combination of digit rocks could he use? Discuss which digits will create a value within set parameters. This question is open-ended for the children to explore.
Various answers, for example: 2,747 + 1,633 = 4,380
- Calculate the total to enable Sebastian to climb to safety. Discuss unconventional partitioning and what each number represents. Discuss how this relates to exchanging.
2,987 + 4,638 = 7,625
National Curriculum Objectives
Mathematics Year 4: (4C2) Add and subtract numbers with up to 4 digits using the formal written methods of columnar addition and subtraction where appropriate
Mathematics Year 4: (4C3) Estimate and use inverse operations to check answers to a calculation
Mathematics Year 4: (4C4) Solve addition and subtraction two-step problems in contexts, deciding which operations and methods to use and why
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