This arithmetic lesson demonstrates how to add 2-digit numbers, without carrying. [Arithmetic playlist: Lesson 2 of 38]
This arithmetic lesson reviews basic subtraction and presents several ways to visualize a subtraction problem. [Arithmetic playlist: Lesson 7 of 38]
This arithmetic lesson shows why borrowing works in subtraction problems. [Arithmetic playlist: Lesson 11 of 38]
This arithmetic lesson shows how Salman Khan subtracts numbers in his head using reverse subtraction order. [Arithmetic playlist: Lesson 9 of 38]
This arithmetic lesson introduces the concept of additon and presents several visual ways to represent addition [Arithmetic playlist: Lesson 1 of 38]
This arithmetic lesson introduces the concepts of borrowing or regrouping and reviews place value. [Arithmetic playlist: Lesson 8 of 38]
This arithmetic lesson demonstrates adding a 2-digit number to a 1-digit number and introduces the concept of carrying. [Arithmetic playlist: Lesson 3 of 38]
This arithmetic lesson introduces basic subtraction and begins with a review of basic addition. [Arithmetic playlist: Lesson 6 of 38]
This arithmetic lesson gives additional practice carrying multiple digit numbers and reviews multiple of tens. [Arithmetic playlist: Lesson 5 of 38]
This arithmetic lesson shows how to carry digits to add multiple digits numbers. [Arithmetic playlist: Lesson 4 of 38]
This arithmetic lesson shows how to subtract multi-digit numbers when borrowing is required. [Arithmetic playlist: Lesson 10 of 38]
Base blocks consist of individual "units," "longs," "flats," and "blocks" (ten of each set for base 10). They can be used to show place value for numbers and to increase understanding of addition and subtraction.
Task Description: This task allows students to demonstrate their understanding of place value. Throughout the task they are required to use operations to solve problems, understand and apply properties of numbers, and compose and decompose numbers in flexible ways. This packet contains a curriculum-embedded CCLS aligned task and instructional supports. The task is embedded in a 2-3 week unit on Number and Operations in Base 10. The mathematics of the unit involves understanding the meaning of base ten and using that understanding to solve number and real life problems. Students will use a variety of tools to help articulate understanding of base ten and to solve problems using addition and subtraction of numbers less than 10, less than 20 and on to less than 100.
Three 60-minute lessons and classroom activities in which students will: 1) apply knowledge of whole numbers and place value by identifying the place value of a digit in a whole number; 2) compare numbers using the greater than, less than, and equal symbols.
Students will develop a sense of the size of a number in relation to other numbers. Prior to these lessons, students should have learned to read, write, and use base-10 blocks to represent 2 digit numbers (place value models). In these lessons, students will continue to use manipulatives to represent two digit numbers and compare the numbers using the >, <, = symbol. A summative assessment is included.
This lesson begins a 4 lesson review about adding whole numbers, carrying in addition, and place value. [Developmental Math playlist: Lesson 10 of 196]
This is the second lesson that reviews the addition of whole numbers, carrying in addition, and place value. [Developmental Math playlist: Lesson 11 of 196]
This lesson reviews how to determine place value in a number by the placement of the decimal point. [Developmental Math playlist: Lesson 78 of 196]
This lesson continues to discuss the place value in relationship to the decimal point in a number [Developmental Math playlist: Lesson 79 of 196]
This lesson reviews the concept of place value. [Developmental math playlist: Lesson 1 of 196]
This lesson continues the review of the concept of place value. [Developmental math playlist: Lesson 2 of 196]
