# Fish Forms

Purpose

This is a level 3 number and algebra activity from the Figure It Out theme series.
A PDF of the student activity is included.

Achievement Objectives
NA3-8: Connect members of sequential patterns with their ordinal position and use tables, graphs, and diagrams to find relationships between successive elements of number and spatial patterns.
NA3-1: Use a range of additive and simple multiplicative strategies with whole numbers, fractions, decimals, and percentages.
Student Activity

Click on the image to enlarge it. Click again to close. Download PDF (426 KB)

Specific Learning Outcomes

use mental strategies to add numbers

Required Resource Materials
FIO, Level 2-3, Theme: Under the Sea, Fish Forms, page 14
Activity

Encourage the students to use systematic counting when calculating the cost of the sea creatures. This will involve looking for common shapes and using multiplication rather than shape-by-shape counting. For example, consider this shape:

Question 3 involves students applying the relationship between the number of trapezia in the body of the sea serpent and the total cost of the creature.
A five-trapezia-bodied serpent costs:

Adding five more trapezia will cost another 75c (5 x 15c), which gives a total cost of \$2.10.
This can be organised in a table to check (60c + [number of trapezia x 15c]).