Reasonix MAC™ · Grade 3
Grade 3 — Multiplication and Events
Rows × columns become nested loops, and events start the program.
Grade 3 at Reasonix MAC: repeated addition to multiplication, arrays of rows and columns, nested loops and Scratch events. Interactive and bilingual.
The three bridges in this grade
Mathematics
Multiplication as repeated addition, arrays, commutativity
Algorithms
A loop inside a loop; an event triggers the whole thing
Coding
when flag clicked · repeat rows [ repeat cols [ stamp ] ]
Try it right now
Move it, click it, and watch the maths, the algorithm and the code change at the same moment.
3 × 4 = 12
MATH
3 × 4 = 12, and 4 × 3 gives the same total — that is commutativity.
ALGO
A loop inside a loop: repeat the row 3 times, stamping 4 dots each time.
CODE
repeat 3 [ repeat 4 [ stamp · move 22 ] · newline ]
Grade 3 lessons
- 1From Repeated Addition to Multiplication
- 2The Array: Rows and Columns
- 3Commutativity: 3×4 = 4×3
- 4What is an Event?
- 5Types of Events in Scratch
- 6Nested Loops for an Array
- 7The Multiplication Table Machine
- 8Messages: Coordinating Sprites