Lesson 1
Name __________________________________________
Adding Two-Digit Numbers
You add numbers to find out how many in all.
Example
Add
Write the sum.
Lesson 2
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Adding Two-Digit Numbers with Regrouping
You add numbers to find out how many in all.
Example
Add
Write the sum.
How many apples did Kay and Jenny pick in all?
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Lesson 3
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Addition Patterns
You can use patterns to help you add.
In the pattern 2, 4, 6, 8, 10, you add 2 to each number to get the next number.
In the pattern 5, 10, 15, 20, 25, you add 5 to each number to get the next number.
Look for the pattern when you add 10.
Examples
Add
Look for the pattern. Add in your head. Write the sums.
Lesson 4
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Adding Three-Digit Numbers
You add numbers to find how many in all.
Example
Add
Write the sum.
Amber drove 352 miles on Monday. She drove 346 miles on Tuesday. How many miles did Amber drive in two days?
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Carl used 214 gallons of paint last year. He used 243 gallons this year. How many gallons of paint did Carl use in two years?
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Lesson 5
Name __________________________________________
Adding Three-Digit Numbers with Regrouping
You add numbers to find how many in all.
Example
Add
Write the sum.
How many pizzas did Scully’s and Alfredo’s sell in June?
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Lesson 6
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Estimating Sums
Sometimes you do not need an exact number. You can estimate.
Examples
Estimate
Estimate each sum. Round each addend to the nearest ten. Then add.
Estimate each sum. Round each addend to the nearest hundred. Then add.
Estimate each sum. Round each addend. Then add.
Tyrell sold 23 cars in his first month as a car salesman. He sold 15 cars in his second month. He sold 38 cars this month. About how many cars did Tyrell sell in three months?
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Lesson 7
Name __________________________________________
Subtracting Two-Digit Numbers
You subtract one number from another number to find out how many are left.
Example
Subtract
Subtract to find the difference.
How many more books did Hasan read than David?
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Lesson 8
Name __________________________________________
Subtracting Two-Digit Numbers with Regrouping
You subtract one number from another number to find how many are left. You also subtract to find out how many more or less one number is from another.
Example
Subtract
Subtract to find the difference.
Lesson 9
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Subtracting Three-Digit Numbers
You subtract one number from another number to find how many are left. You also subtract to find out how many more or less one number is from another.
Example
Subtract
Subtract. Write the difference.
Sassy’s sold 187 pairs of shoes on Saturday and 154 pairs on Sunday. How many more pairs of shoes did Sassy’s sell on Saturday than on Sunday?
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It is 556 miles from Houston to Atlanta. Shelly drove 246 miles today. How many miles does she need to drive tomorrow to reach Atlanta?
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Lesson 10
Name __________________________________________
Subtracting Three-Digit Numbers with Regrouping
You subtract one number from another number to find how many are left.
Example
Subtract
Subtract to find the difference.
Lesson 11
Name __________________________________________
Estimating Differences
When you do not need an exact number, you can estimate to find the answer.
Examples
Estimate
Estimate each difference. Round to the nearest ten and then subtract.
Estimate each difference. Round to the nearest hundred and then subtract.
Lesson 12
Name __________________________________________
Problem Solving: Writing a Number Sentence
You can write a number sentence to help you solve a problem.
Example
Solve
Write a number sentence to solve each problem.
Last week 57 people visited the animal shelter. This week 64 people visited. How many people visited the animal shelter in the last two weeks?
57 + 64 = ?
57 + 64 = 121 people
This week the animal shelter spent $350 on dog food and $160 on cat food. How much more did the shelter spend on dog food than cat food this week?
Last year the animal shelter took in 17 white cats. This year the animal shelter took in 12 white cats. How many more white cats did the shelter take in last year than it did this year?
On Saturday, volunteers collected $549 for the animal shelter. On Sunday, they collected $368. How much money did the volunteers collect last weekend?
Chapter 3 Test
Add or subtract.
Identify the arithmetic pattern.
What is the pattern? ___________ What is the pattern? ___________
Estimate. Round to the nearest ten and then add or subtract.
Estimate. Round to the nearest hundred and then add or subtract.
Add or subtract.
Write a number sentence to help you solve each problem.
Two booths gave away free bottles of water to visitors on the first two days of the summer fair.
About how many bottles of water were given away on the first day? On the second day? Round to estimate.
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Booth 2 had 144 bottles of water in the morning of the second day. How many bottles of water were left at the end of the day?
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Which booth gave away more bottles of water in the two days?
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The fair has 77 booths. If Yuki and her friends went to 38 of the booths, how many booths did they miss?
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The booths are in rows. Row A has 21 booths. Row B has 28 booths. How many booths are in Rows A and B?
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Last year, 847 people attended the fair. This year, 921 people attended. How many more people attended this year?
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