Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.
See related worksheets, workbooks, games, lesson plansFluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.
See related worksheets, workbooks, games, exercises, lesson plansDetermine whether a group of objects (up to 20) has an odd or even number of members, e.g., by pairing objects or counting them by 2s; write an equation to express an even number as a sum of two equal addends.
See related worksheets, workbooks, games, lesson plansUse addition to find the total number of objects arranged in rectangular arrays with up to 5 rows and up to 5 columns; write an equation to express the total as a sum of equal addends.
See related worksheets, workbooks, games, lesson plansUnderstand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones; e.g., 706 equals 7 hundreds, 0 tens, and 6 ones. Understand the following as special cases:
See related worksheets, workbooks, games, lesson plans Count within 1000; skip-count by 5s, 10s, and 100s. See related worksheets, workbooks, games, lesson plans Read and write numbers to 1000 using base-ten numerals, number names, and expanded form. See related worksheets, workbooks, lesson plansCompare two three-digit numbers based on meanings of the hundreds, tens, and ones digits, using >, =, and
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