Counting Numbers( Week 3 Practice) 1. Please find the missing number in 3, 4, 5, 6, ?, 8, 9, ... 2. What is the natural number comes exactly in the middle between 45 and 49? 4. Please find the missing number in 10, 20, 30, 40, 50, 60, ?, 80, 90, ... 5. Please find the missing number in 39, 49, 59, 69, 79, ?, 99, 109, ... |