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Cogito

Grade 3 Math · Chapter 2 · Lesson 4

Practice Worksheet

Adding Within 1,000 Fluently

Faster now, with the blocks in your head.

10 problems · about 13 minutes · 3.NBT.A.2

NameDate

Figure — use these to answer the problems

The blocks are still here when you need them.
First number
and Second number
Altogether

Hundreds

3

Tens

13

Ones

13

268 + 175 = 443

First number268
Second number175
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

3 problems

  1. From “Estimating Sums and Differences”

    Estimate 406 + 195 to the nearest hundred.

    Answer

  2. From “Rounding to the Nearest Hundred”

    Round 649 to the nearest hundred.

    Answer

  3. From “Rounding to the Nearest Ten”

    Round 73 to the nearest ten.

    Answer

Warm Up

Straightforward practice. Get the method working first.

3 problems

  1. 385 + 247 = ?

    Answer

  2. What should you do before adding big numbers?

    • Estimate, so you know what to expect.
    • Nothing. Just start.

  3. 347 + 285 = ?

    Answer

Build It Up

The same ideas with more to keep track of.

1 problem

  1. 506 + 279 = ?

    Answer

Stretch Yourself

Mixed problems. Work out what kind of question it is before you start.

3 problems

  1. 158 + 264 = ?

    Answer

  2. The Book Sale

    346 books were sold on Saturday and 285 on Sunday. How many in all?

    Answerbooks

  3. Two Journeys

    A trip of 429 km, then 268 km. How far in total?

    Answerkm