# Standard Subtraction Algorithm Word Problems

Videos to help Grade 4 students solve two-step word problems using the standard subtraction algorithm fluently modeled with tape diagrams and assess the reasonableness of answers using rounding.

Common Core Standards: 4.OA.3, 4.NBT.4, 4.NBT.1, 4.NBT.2

## New York State Common Core Math Module 1, Grade 4, Lesson 16

### NYS Math Module 1 Grade 4 Lesson 16 Concept Development

Problem 1
Solve a two-step word problem, modeled with a tape diagram, assessing reasonableness of answer using rounding.
A company has 3 locations with 70,010 employees all together. Their first location has 34,857 employees. Their second location has 17,595 employees. How many employees work in their third location?

Problem 2
Solve two-step word problems, modeled with a tape diagram, assessing reasonableness of answer using rounding.
Owen’s goal is to have 1 million people visit his new website within the first four months of it being launched. Below is a chart showing the number of visitors each month. How many more visitors does he need in Month 4 to reach his goal?
Problem 3
Solve a two-step word problem with a compare with smaller unknown base.
There were 12,345 people at a concert on Saturday night. On Sunday night, there were 1,795 fewer people at the concert than on Saturday night. How many people attended the concert on both nights?

NYS Math Module 1 Grade 4 Lesson 16 Homework
Directions: Model each problem with a tape diagram. Estimate and then solve each problem. Explain if your answer is reasonable.
1. Zachary’s final project for a college course took a semester to write and had 95,234 words. Zachary wrote 35,295 words the first month and 19,240 words the second month. How many words did he write during the remaining part of the semester?
a. Round each value to the nearest ten thousand to estimate how many words Zachary wrote during the remaining part of the semester.
b. Find the exact number of words written during the remaining part of the semester.
3. A local store was having a two-week Back to School sale. They started the sale with 36,390 notebooks. During the first week of the sale, 7,424 notebooks were sold. During the second week of the sale, 8,967 notebooks were sold. How many notebooks were left at the end of the two weeks? Is your answer reasonable? Explain how you know using rounding.

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