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Connect small addition facts to parts of a whole.
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.
Build an amount from two parts and find a missing part.
| Term | What it means |
|---|---|
| part | An amount inside the whole. |
| whole | All the parts together. |
Three counters and two counters make five. Slide the two groups together, then separate them again. The whole stays five. The two smaller groups are its parts. We write 3 + 2 = 5. The equal sign says both sides name the same amount.
Another way: picture
● ● ● | ● ● : three and two make five.
Build five with zero and five, one and four, then two and three. Swap the groups: three and two still make five. Practice these small pairs until you can say them without counting every counter. Check a forgotten fact with your fingers. Zero adds nothing. The same idea works through ten: six and three make nine. Tell which two parts your marks show.
Show five and cover two. [Five counters split into two and three]
5 whole; 2 known
The uncovered counters are the other part.
Count the uncovered counters.
3; 2 + 3 = 5
Both parts rebuild the whole.
Build the first part. [Four counters and space for zero extras]
4 counters
Four is already on the mat.
Add no new counters.
What is 2 + 2?
Answer:
A mat needs 9 counters. It has 4. Fill the missing part.
4 + p = 9
What is 1 + 2?
Answer:
Match these new joined groups to their totals.
| 5 | 6 | 7 | |
|---|---|---|---|
| 1 + 4 | |||
| 1 + 5 | |||
| 3 + 4 |
Audio transcript: None
Lesson test: one question per skill, one attempt each, no hints. Your answers are checked when you submit.
What is 1 + 0?
Answer:
Show two ways to make five. How do you know both ways keep the same whole?
6. Find 4 + 0., step 2
4 + 0 = 4
Zero leaves the amount unchanged.