About This Lesson
Lessons included: Count from 20 to 100; Recognize two-digit numbers as combinations of tens and units; Compare and order two-digit numbers; Find 1 more and 1 less than a two-digit number; Count on or back from a two-digit number; Add a single-digit number to a two-digit number on a hundred square; Add a single-digit number to a two-digit number on a number line; Add a single-digit number to a multiple of 10; Add by making a number bond to 10; Add a single-digit number to a two-digit number by bridging; Subtract a single-digit number from a 2-digit number on a hundred square; Subtract a single-digit number from a two-digit number on a number line; Subtract the units from a two-digit number; Subtract a single-digit number from a multiple of 10; Subtract by bridging
