Lesson 13: Speed Calculation Techniques
Expert Level
Instructions
- In this lesson, we'll practice minimizing hand movements for faster calculations.
- Start with 0 and add 37 in one quick motion: Tens (3 blue beads = 30), ones (red bead + 2 blue beads = 7).
- Now add 18 quickly: Tens (add 1 blue bead and handle carry for 5), ones (adjust to 5).
- The value should be 55!
T
100B
10B
B
100M
10M
M
100K
10K
K
100
10
1
5
1
1
1
1
5
1
1
1
1
5
1
1
1
1
5
1
1
1
1
5
1
1
1
1
5
1
1
1
1
5
1
1
1
1
5
1
1
1
1
5
1
1
1
1
5
1
1
1
1
5
1
1
1
1
5
1
1
1
1
5
1
1
1
1
Value: 0