Number and Operations in Base Ten

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Name

PracticeBreak apart the addends to add mentally.

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Make a ten or a hundred to add mentally.

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Homework Helper

There are 58 passengers on a subway train. At the next stop, 33 more passengers board the train. How many passengers are there altogether?

You can add mentally.

Make one addend a ten such as 10, 20, 30, and so on.

58 60

+ 33 + 31

91

+ 2

- 2

Give, or add, 2 to the first addend.

Take, or subtract, 2 from the second addend.

So, 60 + 31 = 91. There are 91 passengers.

Lesson 4

Add Mentally

Helpful Hint60 and 31 are easier numbers to add.

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Vendor: Quad Graphics Grade: 3

Lesson 4 My Homework�83

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Break apart the addends to add mentally.

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Problem Solving

9. 2 Use Number Sense Lambert’s Livery rents canoes every weekend. How many total canoes were rented in June and July?

Lambert’s LiveryCanoe RentalsMonth Rentals

June 154July 198August 176

Test Practice 10. During Math Week, there were 77 visitors

on Monday and 28 visitors on Tuesday. How many visited during Math Week those two days?

A 49 visitors C 105 visitors

B 95 visitors D 205 visitors

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Vendor: Quad Graphics Grade: 3

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