standard_description: Explain why addition and subtraction strategies work, using place value and the properties of operations. (Explanations may be supported by drawings or objects.)
problem_activity: Task
Compare each pair of numbers. Write your comparison using $\lt, =,$ or $\gt$ and in words. Explain your answer with a picture.
99 and 100
154 and 231
453 and 428
351 and 354


aligns: no