CKMath Unit 6: More Decimal and Fraction Operations
Focus:
In this unit, students deepen their understanding of place-value relationships of numbers in base ten, unit conversion, operations on fractions with unlike denominators, and multiplicative comparison. In grade 4, students learned the value of each digit in a whole number is 10 times the value of the same digit in a place to its right. Here, they extend that insight to include decimals to the thousandths. This idea is highlighted as students perform measurement conversions in metric units. Previously, students learned to convert from a larger unit to a smaller unit. Here, they learn to convert from a smaller unit to a larger unit. They observe how the digits shift when multiplied or divided by a power of 10 and learn to use exponential notation for powers of 10 to represent large numbers. Next, students turn their attention to fractions. In this unit, they add and subtract fractions with different denominators. They see that the key is to find a common denominator and analyze different techniques for doing so. Students then solve problems that involve measurement data (in halves, fourths, and eighths) that are displayed on line plots. In the final section, students reason about the size of a product of fractions and that of the factors.
Number of Lessons: 19 and 2 optional
Instruction Time:
Approximately 60 minutes
(Please note that each lesson is designed for one instructional block, and may be divided into shorter or longer segments based on teacher pacing and student needs.)
