NY Next Generation Math NY-1.NBT.3

Math1st GradeUnderstand place value.

The Standard

Compare two two-digit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >, =, and <.

New York State Next Generation Mathematics Learning Standards

Teacher's field guide

What Students Need to Do: Students compare two two-digit numbers by examining the tens first and the ones when needed. They record each comparison with greater than, less than, or equal symbols.
What Mastery Looks Like: A student explains that 63 is greater than 58 because six tens are more than five tens. For 47 and 42, the student compares the ones after noticing the tens are equal and writes 47 > 42.
Common Misconceptions: Students may compare only the ones digits or choose a symbol by its direction without stating the relationship. They may think a number with a larger ones digit is always greater.
How to Assess It: Ask the student to compare 56 with 61 and 74 with 72, write each symbol, and explain which place decided each comparison.

Lesson moves

Build two numbers with ten-sticks and ones, align the place values, and place the correct comparison symbol between them.
Ask students why 39 is less than 42 even though 9 is greater than 2.
Play comparison war with two-digit cards, requiring a tens-and-ones explanation before taking each pair.
Compare two classroom collection totals and record which group has more, fewer, or the same number.

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