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Cogito

Grade 2 Math · Chapter 2 · Lesson 9

Practice Worksheet

Adding and Subtracting on a Number Line

A jump forward adds. A jump back takes away.

10 problems · about 14 minutes · 2.MD.B.6, 2.OA.A.1

NameDate

Figures — use these to answer the problems

Jump the tens first, then the ones.
0102030405060+ 20+ 3

24 + 20 + 3 = 47

Start at24
First jump20
Second jump3
Figure 1
A jump back takes away. Try taking a ten off.
0102030405060− 10

45 − 10 = 35

Start at45
Jump back-10
Figure 2

Warm-Up Review

From earlier lessons. Loosen up before the new work.

2 problems

  1. From “From Ruler to Number Line”

    How far is 13 from 0 on a number line?

    Answer

  2. From “Length Word Problems”

    A 23 cm and a 19 cm strip joined. How long in all?

    Answer

Warm Up

Straightforward practice. Get the method working first.

4 problems

  1. Start at 26 and jump forward 20. Where do you land?

    Answer

  2. Which way does a subtraction jump go?

    • Backwards.
    • Forwards.

  3. 35 + 20 = ?

    Answer

  4. 42 + 14 = ?

    Answer

Build It Up

The same ideas with more to keep track of.

2 problems

  1. 60 − 30 = ?

    Answer

  2. 48 − 12 = ?

    Answer

Stretch Yourself

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

2 problems

  1. The Long Jump

    Ana starts at 31 and jumps forward 20, then 5. Where does she land?

    Answer

  2. Going Back

    Leo starts at 52 and jumps back 20. Where does he land?

    Answer