- When two numbers are multiplied, the product is a multiple of both numbers
- Knowing factors and multiples of numbers helps us estimate products and quotients
Key Concepts:
- rounding numbers to estimate sums, differences, products, and quotients
- using estimation skills to determine if an answer is reasonable.
- using basic multiplication and division facts to find factors and multiples
- breaking down whole numbers into factors or multiplying them to get multiples
- using array and area models to understand multiplication
- Have students practice their multiplication and division facts
- Students round numbers to the nearest 10, 100, 1,000, and 10,000
- Have students create factor trees
- Have students use factor trees to find common multiples
- Have students draw or create arrays with objects at home
- Encourage use of chapter vocabulary
Chapter vocabulary: estimate, reasonable, front-end estimation, rounding, product, quotient, factor, common factor, greatest common factor, prime number, composite number, whole numbers, multiple, common multiple, least common multiple, array model
from the Math in Focus Curriculum
Common Core State Standards
Learning Videos:
Chapter 2 Practice
Workbook Pages
Reteach
Extra Practice
Enrichment
Chapter 2 Review:
Common Core State Standards
- 4.OA.3 Solve multistep word problems posed with whole numbers and having whole- number answers using the four operations, including problems in which remainders must be interpreted. Represent these problems using equations with a letter standing for the unknown quantity. Assess the reasonableness of answers using mental computation and estimation strategies including rounding
- 4.OA.4 Find all factor pairs of a whole number in the range 1–100. Recognize that a whole number is a multiple of each of its factors. Determine whether a given whole number in the range 1–100 is a multiple of a given one-digit number. Determine whether a given whole number in the range 1–100 is prime or composite.
Learning Videos:
- How to Round Numbers
- Front-End Estimation
- How to Find Factors
- Greatest Common Factor
- Least Common Multiple
Chapter 2 Practice
Workbook Pages
Reteach
Extra Practice
Enrichment
Chapter 2 Review:
Chapter Review
Chapter 2 Parent Letter
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