Unit 7 Contents

Estimate answers to these problems. Be ready to tell how you used convenient numbers.

1. A box of crackers weighs 269 grams. John and Kim wondered about how much 5 boxes of crackers weigh altogether.
1. John thought, “Each box weighs about 300 grams, so the 5 boxes weigh about …” Finish his statement.
2. Kim thought, “Each box weighs about 250 grams …” Finish her statement.
2. Ana found 12 tomatoes on one tomato plant. Ana has 11 tomato plants. If all the plants have about the same number of tomatoes, about how many tomatoes do the plants have altogether?
3. You have $70. If a pizza costs $7.75, a bag of apples $2.50, and a quart of milk $1.50, do you have enough money to buy 8 pizzas, 4 bags of apples, and 3 quarts of milk?
4. If a pizza costs $7.75, about how much will 26 pizzas cost?
5. Jacob's brother works at a fast-food restaurant and earns $7.55 an hour. If he worked 21 hours one week, about how much money did he earn?
6. Tanya earned $9.45 babysitting on Friday and $15.25 on Saturday. If she earns the same amount for five weeks in a row, about how much does she earn over the five weeks?
7. A large jar of salsa costs $4.79. A small jar costs $2.89. Estimate which is cheaper to buy: 5 large jars of salsa or 8 small jars of salsa.