Math Review 3.1 Mental Math

There are 771 bees in a hive. Then 100 bees fly out of the hive. How many bees are in the hive now?

• 671

• 761

• 781

Skip-count to complete the number pattern: 294, ___, 314, ___, ___, 344, ___, ___.

• 304, 324, 334, 354

• 304, 324, 334, 344

• 304, 314, 324, 334

A chef has a bin of berries. They use 100 of them. Now there are 135 berries in the bin. How many berries were in the bin at the start?

• 235

• 135

• 100

Decide if each set of numbers shows skip-counting by fives: 455, 555, 655, 755, 855, 955.

• Yes

• No

• Only some

Decide if each set of numbers shows skip-counting by fives: 695, 705, 715, 725, 735, 745.

• Yes

• No

• Only some

Alina earns $410 at her dog walking job. She buys a new leash that costs $10. How much money does Alina have now?

• $400

• $420

• $410

• $390

Complete the skip-counting pattern: 800, 700, 600, ________, ________, ________, ________.

• 500, 400, 300, 200

• 600, 500, 400, 300

• 700, 600, 500, 400

• 800, 700, 600, 500

Complete the skip-counting pattern: 185, 180, ________, ________, 165, ________, ________.

• 175, 170, 160, 155

• 175, 170, 165, 160

• 180, 175, 170, 165

• 180, 175, 170, 160

Complete the skip-counting pattern: 650, 655, 660, ________, ________, ________, ________.

• 665, 670, 675, 680

• 660, 665, 670, 675

• 655, 660, 665, 670

• 660, 665, 670, 680

What number comes next in this pattern? 5, 10, 15, 20, ___

• 22

• 30

• 25

• 20