Grade 5 · Number and Operations in Base Ten

CCSS.MATH.CONTENT.5.NBT.B.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.

Read this standard on the official Common Core site

Lessons that teach this standard

• Adding and Subtracting Decimals

  How to add and subtract decimals by lining up the decimal points, why the alignment matters, and how to handle numbers with different lengths.

• Dividing Decimals: Move the Point, Then Divide

  How to divide by a decimal by shifting both numbers until the divisor is whole, why that shift is allowed, and how to divide a decimal by a whole number.

• Multiplying Decimals: Count the Decimal Places

  How to multiply decimals by ignoring the points, multiplying as whole numbers, then counting the decimal places — and why that count is what it is.