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Counting to one hundred

Count by ones and by tens through one hundred.

Paper packet. Every task here also exists on screen, where it is checked automatically; answers written on paper are not assessed by Nydus. When you are back at a device, enter your answers there.

1. What you will learn

Count through new tens and reach one hundred.

2. Get ready

Count to twenty. Listen for the change from nineteen to twenty before trying a later ten.

3. Our words

TermWhat it means
onesSingle counting steps.
tenA group of ten ones.

4. Two sizes of step

By ones, say every next number. By tens, add a whole group of ten: ten, twenty, thirty, forty, fifty, sixty, seventy, eighty, ninety, one hundred. Use the chart to keep your place. Move along a row for ones. Move down one cell for ten more.

Another way: picture

A ten-by-ten chart: first row 1 to 10, second row 11 to 20, continuing to the last row 91 to 100. Each next cell adds one; each cell directly below adds ten.
A ten-by-ten chart: first row 1 to 10, second row 11 to 20, continuing to the last row 91 to 100. Each next cell adds one; each cell directly below adds ten.

Each row contains ten numbers. The last cell is one hundred.

5. Cross the end of a row

After twenty-nine comes thirty. After thirty comes thirty-one. At a row's end, move to the next row's first cell, not to the cell directly below. Say sixty-nine, seventy, seventy-one. Check each spoken number against its cell. Ninety-nine needs one more to reach one hundred. Counting by tens skips numbers; counting by ones does not.

6. Continue 38, 39.

  1. Finish the current ten.

    38, 39, 40

    One more after thirty-nine is forty.

  2. Begin the next run.

    41, 42

    After a full ten the ones continue.

7. Count by tens from eighty.

  1. Add the next ten.

    80, 90

    The step is ten, not one.

  2. Your turn: work this step out. Its working is at the end of the packet.

    Reach ten full tens.

8. Guided practice

Count by tens. Fill the gap.

50, 60, a, 80

Audio transcript: None

9. Guided practice

A class counts 19 claps, then one more. What is the new count?

Answer:

10. Practice

Count on by ones.

46, a, b, 49

Audio transcript: None

11. Somewhere new

Put these bundle counts in order. Each new bundle holds ten sticks.

Number the steps in order (write the number in the box):

Audio transcript: None

12. Lesson test

Lesson test: one question per skill, one attempt each, no hints. Your answers are checked when you submit.

13. Test question

Count on by ones.

89, a, b, 92

Audio transcript: None

14. What you can do now

Without the chart, count 87 through 100, then count 10 through 100 by tens.

Working for the steps left to you

7. Count by tens from eighty., step 2

100

One hundred follows ninety in this count.