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Cogito

Grade 2 Math · Chapter 5 · Lesson 6

Practice Worksheet

Subtracting Across a Zero

The hardest case, taken slowly.

10 problems · about 15 minutes · 2.NBT.B.7, 2.NBT.B.9

NameDate

Figure — use these to answer the problems

There are no tens. Break a hundred first, then a ten.
Start with
Taken away
What is left

Hundreds

1

Tens

7

Ones

7

305 − 128 = 177

Start with305
Take away128
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

3 problems

  1. From “Breaking a Hundred Apart”

    635 − 172 = ?

    Answer

  2. From “Subtracting Within 1,000”

    758 − 326 = ?

    Answer

  3. From “Making a New Hundred”

    275 + 168 = ?

    Answer

Warm Up

Straightforward practice. Get the method working first.

3 problems

  1. 405 − 137 = ?

    Answer

  2. Why break the hundred before the ten?

    • There are no tens to break yet.
    • Because hundreds are bigger.

  3. 502 − 147 = ?

    Answer

Build It Up

The same ideas with more to keep track of.

1 problem

  1. 600 − 235 = ?

    Answer

Stretch Yourself

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

3 problems

  1. 703 − 158 = ?

    Answer

  2. The Empty Column

    2 hundreds, 9 tens and 15 ones is which number?

    Answer

  3. The Shop Again

    A shop had 400 items and sold 156. How many are left?

    Answeritems