Maths › Year 1 › Autumn Block 4 (Place Value) › 05 Compare Groups of Objects › Compare Groups of Objects Year 1 Place Value Learning Video Clip

Dot and Stan are exploring the Jurassic world during the night. They are trying to count some stars hidden by some clouds, and they discover that some tasty berries are being taken by aliens! Help them to work systematically using number bonds within 10.

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**Discussion points for teachers**

- How many stars could be hidden behind each cloud?

Discuss number bonds to 10. Knowing that the target number is 10, how many number bonds could you create? Discuss using systematic number bonds in order to create as many as you can. This question is open-ended for children t explore.

Allow for a variety of answers, as long as the two numbers given total 10. Various answers, for example:

10 + 0 = 10; 9 + 1 = 10; 8 + 2 = 10. - How many stars could there be behind each cloud now?

Discuss how having 4 stars are now shown to you will limit the number bonds you can use. e.g. one of the bonds will have at least 4 in it, so the other will have 6 or below.

Allow for a variety of answers, as long one of the numbers does not go below 4 and both numbers give a total of 10. Various answers, for example: 4 + 6 = 10; 5 + 5 = 10; 6 + 4 = 10. - Is Stan correct?

Discuss number bonds to 10. If 4 stars are shown to you, why would Stan be incorrect if there are 10 stars in total?

Stan is incorrect. 4 stars have been shown to you so the number of stars behind the other cloud can not be more than 6, otherwise there will be more than 10 stars in total. - What could the total number of berries be?

Discuss using the information that Dot has given to you to work out the hidden berries. Which numbers are more than 6 but less than 10? What would the number bonds for these numbers look like using the berries that are shown to you?

7, 8 or 9 berries - How many berries are there in total?

Discuss counting the berries as this will be needed for later questions.

9 berries. - Can you complete this number sentence?

Discuss the different ways of organising the seahorses on the empty piece of coral to create different numbers. Discuss how many sea horses are on the full piece of coral. This question is open-ended for the children to explore.

7 + 2 = 9 - Work systematically to complete the number sentences to show the alien taking all the berries.

Discuss the number of berries on the bush reducing by one each time as the number of berries on the alien spaceship is increasing until there are no berries left on the bush.

6 + 3 = 9; 5 + 4 = 9; 4 + 5 = 9; 3 + 6 = 9; 2 + 7 = 9; 1 + 8 = 9; 0 + 9 = 9 - How many berries are left for Dot and Stan now?

Discuss using the knowledge of how many berries have been taken by the aliens. How many berries are left at the end?

2 berries

**Optional discussion points:**

Why do you think the alien gave a berry back to Dot and Stan? Discuss how many berries this would leave at the end. Why do you think this number is significant?

**National Curriculum Objectives**

Mathematics Year 1: (1C1) Represent and use number bonds and related subtraction facts within 20

Mathematics Year 1: (1C2b) Read, write and interpret mathematical statements involving addition (+), subtraction (–) and equals (=) signs

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