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Cogito

Grade 1 Math · Chapter 4 · Lesson 4

Practice Worksheet

Writing Teen Numbers

The tens digit always comes first.

10 problems · about 11 minutes · 1.NBT.B.2, 1.NBT.A.1

NameDate

Figure — use these to answer the problems

Change the number. Watch which digit is the tens and which is the ones.

Tens

1

Ones

5

Number15

Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

4 problems

From “Saying It the Ten Way”
Ten five is which number?
Answer
From “Ten and Some More”
10 + 2 = ?
Answer
From “Ten Ones Make One Ten”
How many ones are in one ten?
Answer
From “Adding and Subtracting to Ten”
7 − 2 = ?
Answer

Warm Up

Straightforward practice. Get the method working first.

3 problems

In 16, how many ones are there?
Answer
One ten and 2 ones is which number?
Answer
One ten and 1 one is which number?
Answer

Build It Up

The same ideas with more to keep track of.

1 problem

One ten and 0 ones is which number?
Answer

Stretch Yourself

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

2 problems

Two tens and 0 ones is which number?
Answer
Writing It Down
One ten and 9 ones. What number do you write?
Answer