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One more, one fewer

Connect adding or removing one object with neighboring counting numbers.

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

Today we find one more and one fewer, and check changes by moving real counters.

2. Change words

3. A collection changes

Add one counter to a group. The new amount is the next counting number: one more. Remove one counter instead. The new amount is the number just before: one fewer. Say the starting amount before making a change. If you forget the next or previous word, count the objects again. Counting from one is a useful check, not a mistake.

4. Parts still make a whole

You can also split a small collection. Five counters can be two here and three there, or one here and four there. Push the parts together to check that the whole is still five. Moving counters between parts changes each part, but it does not change the whole unless counters arrive or leave.

5. Snack parts

Use five pretend crackers. Put some in a box and leave the rest on a tray. Name both parts, recombine them, and find a different split.

6. Add a counter

1. 

   Start with six dots.

   Six already there.

   Keep the original collection.

2. Add one in an empty space.

   Seven dots.

   Seven follows six.

7. Remove a counter

1. [Eight]

   Start with eight dots.

   Remove one.

   One object leaves.

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

   Name what remains.

8. Guided practice

A collection has 1 counters. Add exactly one. How many now?

One more than 1 is _more.

9. Guided practice

There are 3 counters. Remove exactly one. How many remain?

One fewer than 3 is _fewer.

10. Practice

Match each frame to its amount AFTER adding one dot to an empty space.

Audio transcript: None

11. Practice

Start with six counters each time. In one trial add one; in a separate trial remove one. Record both new amounts.

After adding one: _more. After removing one: _fewer.

Audio transcript: None

12. Somewhere new

A toy party has 7 guests and one cup for each. One new guest arrives. How many cups are needed altogether now?

Answer:

Audio transcript: None

13. Somewhere new

Five pretend crackers are on a tray. Put two in a lunch box. How many stay on the tray?

Answer:

Audio transcript: None

14. Somewhere new

Split five toy buttons between two trays. First put one in the left tray; record how many belong on the right. Start again with five and put two on the left; record the new right part.

Audio transcript: None

15. Lesson test

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

16. Test question

Ten toy animals are waiting. One goes home. How many animals still need a waiting place?

Answer:

Audio transcript: None

17. What you can do now

Show what changes when one object arrives and what changes when one object leaves a collection.

Working for the steps left to you

7. Remove a counter, step 2