Adding & Subtracting Decimals

Interactive Workbook includes interactive activities and a companion quiz.  This work book is intended to be instructor lead.  Instructors guide is included.


Lesson Objective

Add and subtract decimals, with instruction and practice targeted at correctly organizing numbers to avoid typical computational errors. 

Common Core Alignment

Number & Operations in Base Ten

Understand the place value system.

5.NBT.3.

Read, write, and compare decimals to thousandths.

Read and write decimals to thousandths using base-ten numerals, number names, and expanded form, e.g., 347.392 = 3 × 100 + 4 × 10 + 7 × 1 + 3 × (1/10) + 9 × (1/100) + 2 × (1/1000).

Perform operations with multi-digit whole numbers and with decimals to hundredths.

5.NBT.7.

Add, subtract, multiply, and divide decimals to hundredths, 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.

The Number System

Compute fluently with multi-digit numbers and find common factors and multiples.

6.NS.3. 

Fluently add, subtract, multiply, and divide multi-digit decimals using the standard algorithm for each operation.