Primary 1 · Mathematics
P1 numbers to 10
Ask a P1 child which row has more, and the answer often comes from how long the row looks. Ten seconds with spoons and teaspoons shows why counting beats looking.
- Level
- P1
- Usually taught
- Term 1
- Covers
- 1 concept
What changes at P1
Primary 1 begins with numbers to 10. Your child counts a set of objects and reads and writes each number in numerals and in words (7 and seven). They also compare two groups to say which has more, which has fewer, or whether they are the same.
Most children arrive able to recite to 10. The new part is counting each object exactly once, and knowing that the last number said is how many there are.
The sentence that costs the mark
Row A has 6 big buttons. Row B has 8 small buttons. Which row has more buttons?
What the working usually does
more:the longer row=Row A
Sees Row A stretching further and reads that as more.
What the question asked
more:match one to one=Row B
Pairs each button in A with one in B, and B has 2 left over.
"This row is longer, so it has more" is how adults talk about queues every day. At a glance, the long row really does look fuller. Nothing in the answer shows that no counting happened, which is why it is so easy to miss.
| Group | Detail |
|---|---|
| Row A | 6×button |
| Row B | 8×button |
The same question, worked properly
Do not judge by length
Row A is longer, not fullerThe buttons in Row A are bigger and spread out. That makes the row long, and says nothing about how many buttons are in it.
Match them one to one
6 pairs, 2 left over in Row BThis is the step that fails. Pair each button in Row A with one in Row B. Two buttons in Row B have no partner. An answer given at a glance never does this pairing.
Count to check
8 is greater than 6Row A has 6 buttons and Row B has 8. The count agrees with the matching, so Row B has more.
How can you tell it has clicked?
Lay out two rows where the one with fewer objects is spread wider, and ask which has more. Watch what happens before the answer comes.
A child who pairs the objects up, or points and counts each row, has understood it. A child who answers at a glance is reading the length of the row. That answer is right only when the longer row happens to have more.
One thing to try tonight
Lay 5 spoons far apart and 7 teaspoons close together, and ask which pile has more.
Then pair each spoon with a teaspoon and count what is left over. It takes ten seconds, and the two leftover teaspoons do the explaining.
What your child will meet in this topic
- Numbers to 10
Most Singapore schools introduce this in Term 1, though schools do differ by a term either way. If your child’s school runs a different order, you can set it in the schedule on your dashboard.
What it leads to
Numbers to 20 come next, where a teen number is one ten and some ones. From there, comparing stops being about how a group looks and becomes about the digits.
Matching one to one comes back in picture graphs later in P1. There are two rows of pictures, and the question is which has more, and by how many.
The same topic in other years
It comes back each year and gets harder, so it helps to see what came before and what is coming.
More in Primary 1
Other topics in the same year, so you can see what sits either side of this one.
See how your child is doing on this topic
StudyLah marks each step separately, so you can see whether it was the setup or the arithmetic that cost the mark.