iReady Math G3U1 Lessons 1-3

Rounding to the Nearest 10

100

Round 137 to the nearest ten.

140

200

Round 153 to the nearest ten.

150

300

Round 241 to the nearest ten.

240

400

Round 498 to the nearest ten.

500

500

Round 949 to the nearest ten.

950

Rounding to the Nearest 100

100

Round 243 to the nearest hundred.

200

200

Round 189 to the nearest hundred.

200

300

Round 874 to the nearest hundred.

900

400

Round 351 to the nearest hundred.

400

500

Round 903 to the nearest hundred.

900

Adding 3 Digit Numbers (using place value)

100

Use base ten blocks to add:

102+107=

209

200

Use expanded form to add:

102+167=

100+0+2

100+60+7

200+60+9

269

300

Find the sum using any strategy you want:

317+173=

490

400

Add using expanded form:

204+278=

200+0+4

200+70+8

400+70+12 (add the ten in the number 12 to the tens place)

400+80+2

482

500

Add using base ten blocks:

317+283

600

Subtracting 3 Digit Numbers (using place value)

100

Subtract using any strategy you want:

419-305

114

200

Subtract using base ten blocks:

534-221

313

300

Subtract using expanded form:

728-295

433

400

Subtract using base ten blocks:

970-625=

345

500

Subtract using any strategy:

526-337=

189

Success Criteria

100

What is the rule for rounding?

If it's past the halfway point, round up!

200

Name one of the strategies for adding or subtracting 3 digit numbers.

Base ten 

expanded form

Regrouping/carrying

Partial sums

300

How many ones equal a ten?

10 ones

400

How many tens equal a hundred?

10

500

Which of the following numbers round to 540 when rounded to the nearest 10? Choose all the correct answers.

A) 545

B) 534

C) 541

D) 535

E) 547

C) 541

D) 535