Georgia 3.PAR.3.5
The Standard
Use place value reasoning and properties of operations to multiply one-digit whole numbers by multiples of 10, in the range 10-90.
Georgia's K-12 Mathematics Standards · Use part-whole strategies to solve real-life, mathematical problems involving multiplication and division with whole numbers within 100.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students treat 20, 30, or another multiple of ten as a number of tens. They multiply that number of tens by a one-digit number and rename the result when needed.
What Mastery Looks Like
- Students correctly find products such as 6 × 40 and explain their reasoning with tens, equations, or models. They can connect 6 × 4 tens to 24 tens, or 240.
Common Misconceptions
- Students may solve 3 × 40 as 12 or 1,200 because they lose track of the tens. Some append a zero without understanding that 4 tens multiplied by 3 equals 12 tens.
How to Assess It
- Give an exit ticket: Solve 7 × 60, then show how 7 × 6 helps and label the product in tens.
Lesson moves
Ways to Teach It
Build four groups of 30 with base-ten rods, combine them, and record 4 × 3 tens = 12 tens = 120.
Ask, “Why does 6 × 40 equal 24 tens?” Students write two sentences and draw a place value model.
Play Match It by pairing cards such as 8 × 50, 8 × 5 tens, and 400.
Calculate the cost of seven $20 equipment kits, then explain the answer using groups of tens.
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Printable 3.PAR.3.5 Worksheet
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Related Standards
- 3.NR.1.2
Use place value reasoning to compare multi-digit numbers up to 10,000, using >, =, and < symbols to record the results of comparisons.
- 4.NR.1.3
Use place value reasoning to represent, compare, and order multi-digit numbers, using >, =, and < symbols to record the results of comparisons.
- 3.NR.1
Use place value reasoning to represent, read, write, and compare numerical values up to 10,000 and round whole numbers up to 1,000.
- 4.NR.2.3
Solve relevant problems involving multiplication of a number with up to four digits by a 1-digit whole number or involving multiplication of two two-digit numbe...
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