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topic F
7 hours

Addition of Tens and Ones to a Two-Digit Number


Description

Topic F, focusing on adding like place value units as students add two-digit numbers. The topic begins with interpreting two-digit numbers in varied combinations of tens and ones (e.g., 34 = 34 ones = 3 tens 4 ones = 2 tens 14 ones = 1 ten 24 ones). This flexibility in representing a given number prepares students for addition with regrouping (e.g., 12 + 8 = 1 ten 10 ones = 2 tens or 18 + 16 = 2 tens 14 ones = 3 tens 4 ones). To close the module, students add pairs of numbers with varied sums in the ones place to support flexibility in thinking.

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Credits

From EngageNY.org of the New York State Education Department. Grade 1 Mathematics Module 4, Topic F. Available from engageny.org/resource/grade-1-mathematics-module-4-topic-f; accessed 2015-05-29.
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