Warm-Up 1
Day 3: Decimals and Place Value
Review decimal place value, comparing, rounding, and decimal operations.
Student Goal
I can work with decimals and explain the value of each digit.
Why It Matters
Decimals help students make sense of money, measurement, data, and real-world quantities.
Warm-Up
Warm-Up 2
Which is greater: 2.08 or 2.8?
Warm-Up 3
Round 6.47 to the nearest whole number.
Short Lesson
Standard Focus:
NC.6.NS: The Number System
Student-Friendly Standard Goal:
I can use decimal place value to compare, round, add, and subtract decimals.
- Decimals are built on place value. The first place after the decimal is tenths, then hundredths, then thousandths.
- When comparing decimals, line up the decimal points. You can add zeros at the end to make numbers easier to compare.
- For decimal addition and subtraction, line up decimal points so each place value stays in the correct column.
Guided Examples
Guided Example 1
Add Decimal Money
A notebook costs 2.75 dollars and a pencil costs 0.85 dollars. How much do they cost together?
Step 1
2.75 + 0.85
What should line up before adding?
Guided Example 2
Compare Decimals
Which is greater: 5.9 or 5.19?
Step 1
5.9 = 5.90
Why can we write 5.9 as 5.90?
Practice
Problem 1
Which number is greatest?
Problem 2
Round 8.63 to the nearest whole number.
Problem 3
Find 4.25 + 1.7.
Problem 4
True or false: 2.8 is greater than 2.08.
Problem 5
A bottle holds 1.5 liters. How many liters are in 4 bottles?
Reflection
How are you feeling about today's skill?
Optional reflection: Optional prompt: Where do decimals show up in real life?