我是冼老师,
100以内的合数是：4.6.8.9.10.12.14.15.16.18.20.21.22.24.25.26.27.28.30.32.33.34.35.36.38.39.40.42.44.45.
46.48.49.50.51.52.54.55.56.57.58.60.62.63.64.65.66.68.69.70.72.74.75.76.77.78.80.81.
82.84.85.86.87.88.90.91.92.93.94.95.96.98.99.100
（我建议你把100以内的质数记住,这样就容易找到合数了）
好好加油哦!