Missing Numbers is a timed PowerPoint to practice number sense activities related to AIMSweb Early Numeracy skills. There are 2 PowerPoints each containing 22 timed slides for students to practice filling in the missing numbers from 0 to 20 in the first, middle, or last positions. Once you start the PowerPoint, students have 3 seconds to say the missing number in the sequence. Then the number appears in yellow and moves on to the next slide automatically.