NY Next Generation Math NY-1.NBT.2.c

Math1st GradeUnderstand that the two digits of a two-digit number represent amounts of tens and ones.

The Standard

Understand the numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens (and 0 ones).

New York State Next Generation Mathematics Learning Standards

Teacher's field guide

What Students Need to Do: Students interpret 10, 20, and the other multiples of ten through 90 as groups of tens. They recognize that these numbers contain no leftover ones.
What Mastery Looks Like: A student builds 70 with seven ten-sticks and explains that it has seven tens and zero ones. The student matches the model to the numeral 70 and its number name.
Common Misconceptions: Students may count the ten-sticks as seven ones or read 70 as seventeen. They may ignore the zero instead of understanding that it records no ones.
How to Assess It: Show the numeral 50 and ask the student to build it, name the number of tens and ones, and explain the zero.

Lesson moves

Build each multiple of ten with ten-sticks, then place the model beside its numeral and number-name card.
Ask students what stays the same about 20, 40, and 80 and what changes.
Play exact-tens bingo using models, spoken number names, numerals, and tens-and-ones clues.
Bundle classroom supplies into complete groups of ten and label totals with no leftover ones.

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