Multiply and Divide by 9 Year 4 Multiplication and Division Learning Video Clip

Step 9: Multiply and Divide by 9 Year 4 Multiplication and Division Learning Video Clip

Hamish and Syeda are having a day for leisure. They go into the ski shop to help with the orders, then watch a DJ after enjoying some lunch. They will need to use their knowledge of multiplying and dividing by 9 to ensure the shop has the correct number of items, that they can share their lunch fairly between them and check how many songs the DJ could have played.

More resources for Autumn Block 4 Step 9.

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Discussion points for teachers

1. Help Hamish and Syeda calculate how many boxes of hats the shop should have received.
Discuss how we know if this is a multiplication or a division problem. Discuss different strategies for calculating the division such as counting on in 9s or repeated subtraction.
63 ÷ 9 = 7 boxes

2. Help Hamish and Syeda decide if the shop would receive the same number of waxes and which would be the cheapest orders.
Discuss how we know if this is a multiplication or division problem. Discuss how to calculate how many wax the shop would receive with order A. Discuss the best strategy for calculation how many waxes the shop would receive with order B.
Order A = 72 waxes = ¥4,200. Order B = 4 x 2 x 9 = 72 waxes = ¥4,000. Order B would be the cheapest.

3. How many of each item could the shop have received?
Discuss which numbers we can work at straight away. Discuss how many of the goggles and helmets they could have received with the remaining items. Discuss how many of the jackets the shop could have received.
Various answers, for example: ski trousers = 27; goggles = 18; helmets = 9; jackets = 45

4. Help Hamish and Syeda calculate how many of each item they will have and help them decide a fair way to share the sushi between them.
Discuss how many maki and nigiri they would receive from 4 boxes. Discuss how they can be shared fairly if there is an odd number of both types of sushi.
3 x 4 = 12 nigiri; 6 x 4 = 24 maki. 24 + 12= 36 sushi pieces. Each person would receive 18 pieces. Various answers, for example: 6 Nigiri and 12 maki each.

5. Help Hamish and Syeda calculate the different combinations of songs the DJ could have played.
Discuss whether 48 is a multiple of 9. Discuss which multiples of 9 could be included and whether the remaining part can be made up of multiples of 6. This question is open-ended for the children to explore.
Various answers, for example: 4 x 9-minute songs = 36 minutes. 2 x 6-minute songs = 12 minutes. 36 + 12 = 48 minutes.

Optional discussion points:
Discuss why they would be eating sushi and Japan’s culinary traditions.

National Curriculum Objectives

Mathematics Year 4: (4N1) Count in multiples of 6, 7, 9, 25 and 1000
Mathematics Year 4: (4C6a) Recall multiplication and division facts for multiplication tables up to 12 × 12

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