Monster’s Mixed Up Number
Can your students crack the monster’s code? In this engaging reasoning activity, students use mathematical clues to reconstruct a mystery 5-digit number. Each clue targets key place value concepts such as digit sums, relative value, and odd/even properties, encouraging deep thinking and logical deduction. With four unique puzzles and a bonus ‘create your own’ task, this resource supports both practise and extension through higher order clue writing and peer testing.
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Learning goals
- We are learning to recognise and extend place value to tenths and hundredths use decimal notation to name and represent decimals.
- We are learning to make connections between fractions and decimals to tenths and hundredths.
Curriculum alignment
AC9M4N01
9
Recognise and extend the application of place value to tenths and hundredths and use the conventions of decimal notation to name and represent decimals
ACMNA079
8.4
Recognise that the place value system can be extended to tenths and hundredths. Make connections between fractions and decimal notation
MA2-1WM
old
Uses appropriate terminology to describe, and symbols to represent, mathematical ideas
MA2-3WM
old
Checks the accuracy of a statement and explains the reasoning used
MA2-7NA
old
Represents, models and compares commonly used fractions and decimals
MA2-RN-01
new
Applies an understanding of place value and the role of zero to represent numbers to at least tens of thousands
MA2-RN-02
new
Represents and compares decimals up to 2 decimal places using place value
MA2-MR-01
new
Represents and uses the structure of multiplicative relations to 10 × 10 to solve problems
MA2-MR-02
new
Completes number sentences involving multiplication and division by finding missing values
MA2-AR-01
new
Selects and uses mental and written strategies for addition and subtraction involving 2- and 3-digit numbers
MA2-AR-02
new
Completes number sentences involving addition and subtraction by finding missing values
Australian Curriculum covers QLD / SA / WA / NT / TAS / ACT.