Unit 4
Numbers to 120 and Comparing with Place Value
Unit 4 Overview:
In this unit, children will continue to practice counting, reading and writing numbers to 120 using 120s charts and number lines. They will explore two-digit numbers as they learn the value of the “tens” place and “ones” place. They will compare two-digit numbers as “greater than”, “less than” and “equal to” using their understandings of tens and ones.
- Students will count to 120, starting at any number less than 120 and in this range, read and write numerals and represent a number of objects with a written numeral. (1.NBT.A.1)
- Students will understand that the two digits of a two-digit number represent amounts of tens and ones. (1.NBT.B.2)
- Students will understand that 10 can be thought of as a bundle of ten ones (called a “ten”) (1.NBT.B.2a)
- Students will understand that the numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones. (1.NBT.B.2b)
- Students will understand that 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). (1.NBT.B.2c)
- Students will compare 2 two-digit numbers with concrete models using the knowledge of place value represented by tens and ones, recording the results with the comparing symbols. (1.NBT.B.3)
- Students will be able to find 10 more or 10 less than a number using manipulatives and counting strategies. (1.NBT.C.5)
Home Activities
- Exploring for numbers is fun! Find 2 digit numbers in everyday life and talk with your child about how many tens/ones are in the number.
- Math Writing: Have your child practice counting, reading and writing numbers to 120. Focus especially on numbers 100-120, as these numbers can be most tricky for children.
Understanding that each digit in a two-digit number represents a specific value in either the tens place or the ones places is the basis for comparing numbers using the language and symbols: greater than >, less than <, and equal to =.
Understanding Place Value
Children learn that the concepts of tens and ones is the basis of our number system. Composing (building) and decomposing (breaking apart) a group of ten is an essential understanding for future work in addition and subtraction.
- Place Value Card Game- Use a deck of cards for this two player game. Place a deck of cards in between both players. Player one turns over the top two cards and makes a two digit number. Player two turns over the next two cards and makes a two digit number. Compare numbers. The player with the highest (or lowest) number wins the cards. Keep playing until the cards are gone. The player with the most cards at the end wins.
Resources
Websites/Videos/Games
- Introduces children to the greater than, less than and equal to symbols as they compare objects.
Other Resources - APPS
Math Slide 100 (Apple)
Math Slide is a multiplayer game helping children understand tens and ones; numbers up to 100. Players learn by sliding tiles into the center to match an answer, equation or image. The player who slides their tiles first wins.
Number Pieces (Apple)
Number Pieces helps students develop a deeper understanding of place value while building their computation skills with multi-digit numbers. Students use the number pieces to represent multi-digit numbers, regroup, add, subtract, multiply, and divide. This virtual version of the manipulative is an open-ended educational tool, ideal for elementary classrooms and other learning environments that use iPads.
Math Words
These are vocabulary words that students will be exposed to throughout the unit.
- add
- subtract
- difference
- total
- equal
- add to
- take away
- take from
- part
- part-part-whole
- ten frame
- decompose
- greater
- fewer