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Cogito

Grade 2 Math · Chapter 5 · Lesson 1

Practice Worksheet

Adding and Subtracting Hundreds

Whole hundreds behave like single digits.

10 problems · about 11 minutes · 2.NBT.B.7

NameDate

Figure — use these to answer the problems

Count the flats on each row, then count them all.
First number
and Second number
Altogether

Hundreds

5

Tens

0

Ones

0

300 + 200 = 500

First number300
Second number200
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

2 problems

  1. From “Two-Step Word Problems Within 100”

    55 apples. 27 more arrive. 34 are sold. How many are left?

    Answer

  2. From “Word Problems Within 100”

    47 birds. 28 fly away. How many are left?

    Answer

Warm Up

Straightforward practice. Get the method working first.

4 problems

  1. 400 + 500 = ?

    Answer

  2. 700 − 200 = ?

    Answer

  3. 200 + 600 = ?

    Answer

  4. 500 + 500 = ?

    Answer

Build It Up

The same ideas with more to keep track of.

2 problems

  1. 800 − 300 = ?

    Answer

  2. 600 − 600 = ?

    Answer

Stretch Yourself

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

2 problems

  1. Two Schools

    One school has 300 pupils and another has 500. How many altogether?

    Answerpupils

  2. The Fundraiser

    A target of 900 pounds has 400 raised so far. How much is still needed?

    Answerpounds