Subtraction Fishbowl

**Key Elements and Scene Summary**

Young learners immerse (and submerge!) themselves in this bowling alley, with activities that visualise interpretations of subtraction. Aquatic characters take away from their takeaway, bowling pins are knocked down from sets of ten, and a striking water fountain depletes as the numerals on a display gauge decrease. Learners are enticed to discover what lies beneath the lanes in this enchanting, otherworldly scene.

# Learning Objectives

Compute subtractions accurately using ten frames and part-whole models{.info}

Recognise different problem contexts where subtraction is required{.info}

Use knowledge of number bonds to check answers to a subtraction{.info}

# Bowling at Sunset{.objective .objective1}

- The bowlers each knock down from different amounts – the octopus from 10 and Poseidon from 20. The activity furthers understanding of what each number represents in a subtraction number sentence.
- Learners will understand that the minuend corresponds to the full set of 10, the subtrahend corresponds to those pins knocked down, and the remainder goes next to the equals sign.

# Now You Seafood, Now You Don’t{.objective .objective2}

- Learners can change their avatar by the diner, resulting in two ten frames of clamburgers appearing in front of them. They can then go underwater into the fishbowl, where walking up to each fish causes burgers to be taken away. Learners should write a number sentence to represent this subtraction.
- Additional ten frames on the diner table allow users to create their own plates. This permits questions like ‘What is the difference?’

# Flowaway Fountain{.objective .objective3}

- The fountain serves as a part-whole model of subtraction, allowing learners to see how numbers may be partitioned. Learners observe the fountain depleting tier by tier.
- The bottom tier has movable numbers to support partitions of 40. This can be differentiated: some learners may realise that only certain combinations can be made, since each digit only appears once.

# Teacher Resources

### Download Teacher Notes

[](https://avnfs.com/VVC_7oP4Z7DCYSQmCV1_swXPzishE-HL-eK36pqfCDs?size=1192707&type=application%2Fpdf&name=Subtraction+Fishbowl+Teachers+Notes+1.pdf)

### Student Worksheet Answers Document

[](https://avnfs.com/prDp5WKWIE6VV9h_ZSjmbs74dLP70nN48hCWXZPrpqA?size=855990&type=application%2Fpdf&name=Subtraction+Fishbowl+Teachers+Notes+2.pdf)

### Download the Student Worksheet Document

[](https://avnfs.com/4bJ_3XTPB8DFmO5XJaFJYmzNLqn0AlzHsGehF240tAs?size=329978&type=application%2Fpdf&name=Subtraction+Fishbowl+Teachers+Notes+3.pdf)