Free Multiply 4 Digits by 1 Digit Year 5 Multiplication and Division Learning Video Clip
Step 1: Free Multiply 4 Digits by 1 Digit Year 5 Multiplication and Division Learning Video Clip
Pupils join the Ancient Greeks as they attempt to enter the city of Troy by building the Trojan Horse. Children will help Alexios work out the cost of materials, the number of meals needed to feed the Greek army and use reasoning to find the answer to a number game which two soldiers are playing whilst they hide inside the Trojan Horse.
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Discussion points for teachers
1. Alexios expects the build to take between 3 and 5 days to complete. How much could it cost to build the wooden horse?
Discuss which information is necessary for the problem and methods used to calculate the answer, such as formal written method. This is an open-ended question for children to explore.
Various answers, for example: 1,304 x 4 = 5,216 coins.
2. What mistake has Alexios made with his calculation?
Discuss how to lay the formal written method out and when and how to exchange.
Alexios has forgotten to exchange in the ones and the thousands. The answer should be 5,216 coins.
3. Help the Greeks calculate the cost of feeding their army.
Discuss the layout of the formal written method and whether or not exchanges are required.
The total number of meals needed is: 8,164 (2,041 x 4).
4. Help Alexios complete the calculation to come up with the code which all Greeks will know.
Discuss how the use of zero and the use of exchanges can help to complete the calculation.
The correct answer is: 2,350 x 3 = 7,050.
5. Who is correct? Explain why.
Discuss place value and the possible combinations which could be used in order to get the greatest product.
Orion is correct. The greatest product is 12,884 (3221 x 4).
National Curriculum Objectives
Mathematics Year 5: (5C7a) Multiply numbers up to 4 digits by a one- or two-digit number using a formal written method, including long multiplication for two-digit numbers
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