Unit 02 Resources
Unit 02 - Addition and Subtraction of Whole Numbers and Decimals
In Grade 3, students learned strategies for rounding to the nearest 10 or 100, and practiced the analysis of numbers within problems to determine a need for either rounding or using compatible numbers to justify the reasonableness of solutions. They progressed in addition and subtraction skills through representing and solving one- and two-step problem situations that promoted the use of place value, properties of operations, and the examination of different ways to represent the situation and their solution process. Students also described the relationship between the availability or scarcity of resources and how that impacts cost, and explained that credit is used when wants or needs exceed the ability to pay and that it is the borrower's responsibility to pay it back to the lender, usually with interest.
In Grade 4, Students represent multi-step problems involving addition and subtraction of whole numbers using strip diagrams and equations with a letter standing for the unknown quantity. Students extend their understanding of rounding to whole numbers through the hundred thousands place using their choice of strategies. Mathematical and real-world problem situations are analyzed for vocabulary that indicates estimation, and for whether rounding to the nearest 10, 100, or 1,000 or using compatible numbers could be used to find a reasonable estimate. Students develop the ability to recognize vocabulary descriptors that describe the effects of the adjustment on the estimation compared to the actual solution. Grade 4 students make connections between place value and the standard algorithms for adding and subtracting whole numbers to adding and subtracting decimals, including tenths and hundredths. They relate addition and subtraction of decimals to the hundredths place using concrete objects and pictorial models to the standard algorithm for adding and subtracting decimals. Skill with the standard algorithm for the addition and subtraction of decimals is applied as students determine profit from single or multiple sources for incomes and/or expenses.
Textbook Correlation
4.4A - I can add and subtract whole numbers and decimals to the hundredths place using the standard algorithm.
Parent Resources:
Student Resources:
4.5A - I can represent multi-step problems with whole numbers using strip diagrams and equations.
Parent Resources:
Student Resources:
4.2D - I can round whole numbers to a given place value through the hundred thousands place.
4.4G - I can round to the nearest 10, 100, or 1,000 or use compatible numbers to estimate solutions involving whole numbers.
Parent Resources:
4.10B - I can calculate profit in a given situation.
4.10E - I can describe the basic purpose of financial institutions, including keeping money safe, borrowing money, and lending.