10000里面有几个十？

解：10000里面有（ 1000 ）个十

∵已知需求出10000里面有几个十

1个10 = 1 × 10 = 10

2个10 = 10 + 10 = 2 × 10 = 20

∴设10000里面有x个十

x × 10 = 10000

10x = 10000

x = 10000 ÷ 10

x = 10000 × 1/10

x = 10000/10

∴x = 1000

答：10000里面有1000个十