1.NBT - Number & Operations in Base Ten

From EngageNY

Extend the counting sequence.
  1. Count to 120, starting at any number less than 120. In this range, read and write numerals and represent a number of objects with a written numeral.
Understand place value.
  1. Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:
    • 10 can be thought of as a bundle of ten ones — called a “ten.”
    • The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.
    • 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).
  2. Compare two two-digit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >, =, and <.
Use place value understanding and properties of operations to add and subtract.
  1. Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.
  2. Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.
  3. Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90 (positive or zero differences), using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used.

Supporting Materials

Game

4 Way Countdown

Players compete to achieve all numbers from 1 through 10 using 2 dice and simple math. Score is marked with wooden pegs that are flipped when a number is achieved. Basically a four player version of Shut the Box. But it includes some variation. Players may not use the two dice as separate...

ebook

Counting by 2s Poem

This TumbleMath poem teaches students how to count by 2s using multiplication strategies, thereby identifying even numbers. This will help build a foundation for skip-counting with higher numbers.
ebook

Counting Coconuts

Monkey has gathered a huge pile of tasty coconuts. Before he can enjoy them he must count them. He discovers counting in sets is the fastest way to complete the task.


Keywords: rainforest, animals, habitats, numbers
ebook

Counting Envelopes

Numbers 1 & 2 count and compare the number of envelopes they each have. Find out who has more!
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Hide and Seek

Numbers 1 and 2 want to play a game of Hide and Seek! Help them count to 100!
STEAM Kit

Makey Takey: Place Value

This kit is designed for use in a center with a 1st grade class to address the NY Common Core Math standard 1.NBT.2: Understand that the two digits of a two-digit number represent amounts of tens and ones. During this lesson, students will determine which pressure switch activates each place...

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