Decimal

A decimal is a way of expressing numbers that are not whole numbers (integers). It is based on the powers of 10 and includes a decimal point. The digits to the right of the decimal point represent parts of a whole number, such as tenths, hundredths, thousandths, and so on.

For example, in the decimal 3.14, the digit 3 is in the ones place, the digit 1 is in the tenths place (1/10), and the digit 4 is in the hundredths place (4/100).

Decimals are used in various mathematical operations, including addition, subtraction, multiplication, and division. They are also commonly used in everyday measurements, such as money, length, and weight.

Understanding decimals is important for working with money, understanding place value, and comparing the size of numbers.

◂Math Worksheets and Study Guides Third Grade. Double Digit Addition

Study Guide

Double Digit Addition

Worksheet/Answer key

Double Digit Addition

Worksheet/Answer key

Double Digit Addition

Worksheet/Answer key

Double Digit Addition

Worksheet/Answer key

Double-Digit Addition

The resources above cover the following skills:

Number and Operations (NCTM)

Compute fluently and make reasonable estimates.

Develop fluency in adding, subtracting, multiplying, and dividing whole numbers.

Select appropriate methods and tools for computing with whole numbers from among mental computation, estimation, calculators, and paper and pencil according to the context and nature of the computation and use the selected method or tools.

Algebra (NCTM)

Use mathematical models to represent and understand quantitative relationships.

Model problem situations with objects and use representations such as graphs, tables, and equations to draw conclusions.

Connections to the Grade 3 Focal Points (NCTM)

Number and Operations: Building on their work in grade 2, students extend their understanding of place value to numbers up to 10,000 in various contexts. Students also apply this understanding to the task of representing numbers in different equivalent forms (e.g., expanded notation). They develop their understanding of numbers by building their facility with mental computation (addition and subtraction in special cases, such as 2,500 + 6,000 and 9,000 - 5,000), by using computational estimation, and by performing paper-and-pencil computations.