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Level Three > Number and Algebra

Sea Shelters

Keywords:
Purpose: 

This is a level 3 and 4 number activity from the Figure It Out theme series.

Achievement Objectives:

Achievement Objective: Use a range of additive and simple multiplicative strategies with whole numbers, fractions, decimals, and percentages.
Achievement Objective: Use a range of multiplicative strategies when operating on whole numbers.

Specific Learning Outcomes: 

choose a mental strategy to solve addition and subtraction problems

solve multiplication problems using tidy numbers and place value

Required Resource Materials: 
FIO, Level 2-3, Theme: Under the Sea, Sea Shelters, page 20
Activity: 

Students can use various methods to find out which place each creature lives in without performing the calculations. These methods include:
• Ones-digit focus
(For example, 245 x 3 will have an answer with a ones digit of 5, and so that sea creature must live in the shipwreck.)
• Estimating the relative size of answer
(For example, 1000 – 176 will have an answer greater than 800, and so that sea creature must live in the coral.)
• Applying place value
(For example, 103 x 8 is (100 x 8) + (3 x 8), which is 824, and so that creature must live in the coral, or 300 + 70 + 8, which is 378, and so that sea creature must live in the seaweed.)

Answers to Activity

Seaweed: b, c, k, l, u, r
Coral: d, e, j, n, s
Kelp: a, g, i, o
Shipwreck: f, h, m, p, q, t
 


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