L3 · 三
Intermediate
mixed operations and faster accuracy
Lessons
Study first
- Mixed Two-Digit Fluency
Build calm fluency with two-digit mixed operations before speed becomes the goal.
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Exercises
Practice next
- Mixed two-digit sequence
The key is holding place value calmly through each step.
Open exercise → - L3 mixed, sequence columns · 3-4 digits
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Open exercise → - Two-digit subtraction check
Read the value again after subtraction to confirm each place stayed stable.
Open exercise → - Carry rhythm check
This drill checks whether a carry is actually landing as a stable new total before the next subtraction begins.
Open exercise → - Sign-switch relay
This drill is meant to feel like a relay. Each sign change should pass the full total cleanly to the next step.
Open exercise →