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Number Theory

Level 23 - realistic untimed

Rules - small (2, 3, 4, 5)

6 visual blocks - structure tests

1

Read the shape

Level 23 visual plan for Rules - small (2, 3, 4, 5)
Look for digit and factor structure. Rules - small (2, 3, 4, 5).

Look for digit and factor structure. Rules - small (2, 3, 4, 5).

2

Pick the method

Number Theory: block 2 Visual guide level shape Rules - small (2, 3, 4, 5)Pick the methodUse divisibility, remainders, GCD, or LCM. image-first, then practice
Use divisibility, remainders, GCD, or LCM.

Use divisibility, remainders, GCD, or LCM.

3

First move

Number Theory: block 3 Visual guide level shape Rules - small (2, 3, 4, 5)First moveRun the cheapest test first. image-first, then practice
Run the cheapest test first.

Run the cheapest test first.

4

Check

Number Theory: block 4 Visual guide level shape Rules - small (2, 3, 4, 5)CheckUse GCD x LCM = product when relevant. image-first, then practice
Use GCD x LCM = product when relevant.

Use GCD x LCM = product when relevant.

5

Play the mode

Number Theory: block 5 Visual guide level shape Rules - small (2, 3, 4, 5)Play the modeSpend the extra second on the check. image-first, then practice
Spend the extra second on the check.

Spend the extra second on the check.

6

Watch-out

Number Theory: block 6 Visual guide level shape Rules - small (2, 3, 4, 5)Watch-outDo not trial-divide every number. image-first, then practice
Do not trial-divide every number.

Do not trial-divide every number.

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