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.

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?

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