iReady Math 2nd Grade Lesson 15 Session 3

Multiple Choice

Why is it important to be able to add and subtract numbers like 10 and 100 mentally?

• It helps with quick calculations in daily life.

• It is only useful for math tests.

• It makes numbers more confusing.

• It is not important at all.

Fill in the Blank

An Amish furniture store has 432 mailboxes for sale. It has 100 more mailboxes delivered. How many mailboxes does the store have now?

Multiple Choice

What is the result when you add 100 to 432?

• 532

• 432

• 5320

• 332

Poll

Which models or strategies do you like best for adding or subtracting 10 and 100?

Fill in the Blank

There are 893 people at a science center. 100 people go home. How many people are at the science center now?

Drag and Drop

539 + 10 =​ ​

Placeholder

704 + 100 = ​

Placeholder

699 + 10 = ​

Placeholder

Drag these tiles and drop them in the correct blank above

549

804

709

609

714

529

689

Drag and Drop

675 - 100 =​

Placeholder

226 - 100=​

Placeholder

491 - 10 = ​

Placeholder

Drag these tiles and drop them in the correct blank above

575

126

481

501

326

775

685

591

236

Multiple Choice

288 - 10 =

• 188

• 278

• 287

• 298