多位数加法

  • (10 to 20) + (1 to 9)

  • (10 to 30) + (1 to 9)

  • (10 to 40) + (1 to 9)

  • (10 to 50) + (1 to 9)

  • (10 to 60) + (1 to 9)

  • (10 to 70) + (1 to 9)

  • (10 to 80) + (1 to 9)

  • (10 to 90) + (1 to 9)

  • (10 to 100) + (1 to 9)

    • 多位数减法

  • number - (10 to 20) = (1 to 9)

  • number - (10 to 30) = (1 to 9)

  • number - (10 to 40) = (1 to 9)

  • number - (10 to 50) = (1 to 9)

  • number - (10 to 60) = (1 to 9)

  • number - (10 to 70) = (1 to 9)

  • number - (10 to 80) = (1 to 9)

  • number - (10 to 90) = (1 to 9)

  • number - (10 to 100) = (1 to 9)

    • 读钟: 读分钟

  • 从时钟读取分钟(0-10)

  • 从时钟读取分钟(10-20

  • 从时钟读取分钟(20-30)

  • 从时钟读取分钟(30-40)

  • 从时钟读取分钟(40-50

  • 从时钟读取分钟(50-59)

  • 从时钟读取分钟(0-59)

    • 数字模式

  • 数字模式-递增 (1-9)

  • 数字模式-递增 (10-19)

  • 数字模式-递增 (20-29)

  • 数字模式-递增 (10-19)

  • 数字模式-递增 (20-30)

    • 平衡方程

  • 平衡方程-加法

  • 平衡方程-减法