Adding and Subtracting Whole Numbers
Common Core State Standards:
4.NBT.3 Use place value understanding to round multi-digit whole numbers to any place.
4.NBT.4 Fluently add and subtract multi-digit whole numbers using the standard algorithm.
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.
• place value vocabulary from previous unit
• division/ divide
• mental computation
In this unit, students will apply their understanding of place value to help solve for multi-step word
problems with addition and subtraction. Students will utilize estimation as part of the problem solving
process. One example is students rounding to the nearest leading digit. This will help students to check
their solution or answer after solving to see if it is reasonable. In addition, students will need to be fluent
with numbers in order to break them apart or reconstruct them by place value.
Students will build on their understanding of addition and subtraction by using place value strategies to
make sense of the standard algorithms. They are expected to use a variety of models to support their
reasoning about numbers.
• Base Ten blocks
• Show Subtotals Method
• Relationship between multiplication & division
Video Support can be found on The WCPSS Academics YouTube Channel.
Video support can be found on LearnZillion.
o Solve multi-step word problems by rounding on a number line.
o Solve multi-step word problems using front-end estimation
Mrs. Ana Rhyne
I teach 4th grade math and science at Weatherstone Elementary School. I graduated from Meredith College with a BA in Spanish and K-6 licensure.