Why Does My Child Forget Math Facts They Knew Yesterday?
No study we hold follows children's number facts from one day to the next. In our experience, some facts are still being worked out. Those can come easily one day and not the next. Keep the practice going, and check what the fact means alongside it. Our position is that a lost skill goes to a doctor first.
TL;DR
- No study we hold follows children's number facts from one day to the next.
- In our experience, some facts are still being worked out. Those can come easily one day and not the next.
- One study followed children through second and third grade (Jordan and colleagues, 2003). Some of them had poor recall of number facts. Their timed fact recall grew very little in that time. The study timed the facts, and it covered two grades. We could read only its summary.
- Keep the practice going, and check what the fact means alongside it. In our view, a math fact sticks when the child understands it and practices it.
- Keep teaching the math while you work out what is hard. Our position is that a lost skill goes to a doctor first.
Dyscalculia describes lasting difficulty with number and calculation, out of step with the rest of a child's learning. In our view, the word tells you what is hard more than why.
”DyscalculiaWhat we hold on facts from one day to the next
No study we hold follows children's number facts from one day to the next.
In our experience, some facts are still being worked out. Those can come easily one day and not the next.
Studies of facts that are slow to come
One study followed children through second and third grade (Jordan and colleagues, 2003). Some of them had poor recall of number facts. Their timed fact recall grew very little in that time. Their other math, like story problems, grew at a normal rate. The authors call the trouble with facts "highly persistent". That is a finding about many children. The study timed the facts, and it covered two grades. We could read only its summary.
Another study followed children from grade 2 to grade 4 (Geary and colleagues, 2012). Some had severe trouble recalling facts. Asked for an addition fact, they tended to give a nearby counting number instead. The severe group was small, and these are group findings. We could read only its summary.
What a guideline lists about facts
A German medical guideline summary lists signs of dyscalculia (Haberstroh and Schulte-Körne, 2019). Facts worked out again every time, instead of remembered, can be one sign. The summary judges mistakes by how varied, lasting and frequent they are. In our view, that is for a professional to judge, not a home test.
How facts are practiced
One small study compared two ways to practice multiplication facts (Burns and colleagues, 2019). It had 29 third and fourth graders with low math skills. The children kept more facts with a method called incremental rehearsal than with ordinary drill. The summary we read does not say how long after practice they were tested.
Keep the practice going, and check what the fact means alongside it. In our view, a math fact sticks when the child understands it and practices it. Keep teaching the math while you work out what is hard.
If a math skill has gone
Some children could do something and now cannot. That is different from a child who has not built the skill yet. Our position is that a lost skill goes to a doctor first. In our view, make that appointment soon. We cannot tell you why a skill was lost. Tell the doctor what math your child could do before, and what is different now.
When to ask for help
Each of these is a reason to ask for help on its own.
- Little change, even with steady practice and good teaching.
- Math well below your child's other schoolwork.
- A teacher who raises a concern about math.
- Extreme upset about math.
- Complete avoidance of math.
- Worry about math that spreads into the rest of learning.
- Sadness or worry that lasts.
- A skill that was there and has gone. Our position is that a lost skill goes to a doctor first, not a tutor.
If no skill has gone, start with the teacher. Say what you are seeing at home, and what you have tried. Beyond the teacher, the right person depends on what it turns out to be about. If the work is too hard, someone who works on that school skill. If worry or mood is the thing, someone who works with children's mental health. In our view, if you are worried enough to ask, a professional evaluation is worth asking about.
Any talk of hurting themselves is a same-day call to your doctor or a crisis line.
In the classroom
In our view, note which facts come quickly and which are still worked out.
One sentence for an email home: "He knew 7 + 8 quickly on Monday, but counted it out today. What do you see in class?"
Key Takeaways
No study we hold follows children's number facts from one day to the next.
In our experience, some facts are still being worked out. Those can come easily one day and not the next.
Keep the practice going, and check what the fact means alongside it.
In our view, a math fact sticks when the child understands it and practices it.
Keep teaching the math while you work out what is hard.
Our position is that a lost skill goes to a doctor first, not a tutor.
Pick five facts from this week's math. Ask your child to say each one. Write down which came quickly and which were worked out. If no skill has gone, take your notes to the teacher.
”What to do tonightWhat to use next
A set of questions you answer about what you see at home. A screener is a starting point, not a diagnosis. If your child might need formal accommodations (an IEP or 504 plan), or you suspect a vision, hearing, or medical cause, pursue a professional evaluation too — that's the only route to those supports.
What sits underneath arithmetic, one skill at a time, worked alongside math instruction, not in place of it.
Common questions from parents
Does my child forget math facts overnight?
No study we hold follows children's number facts from one day to the next. In our experience, some facts are still being worked out. Those can come easily one day and not the next. Our position is that a lost skill goes to a doctor first. If no skill has gone, start with the teacher.
My child knew the facts yesterday but not today. Is that a sign?
The research we hold cannot say. No study we hold follows children's number facts from one day to the next. A German medical guideline summary lists signs of dyscalculia (Haberstroh and Schulte-Körne, 2019). Facts worked out again every time, instead of remembered, can be one sign. The summary judges mistakes by how varied, lasting and frequent they are. In our view, that is for a professional to judge, not a home test. Our position is that a lost skill goes to a doctor first. If no skill has gone, start with the teacher.
My child cannot retain math facts. What can we do?
Keep the practice going, and check what the fact means alongside it. Keep teaching the math while you work out what is hard. One small study compared two ways to practice multiplication facts (Burns and colleagues, 2019). It had 29 third and fourth graders with low math skills. The children kept more facts with a method called incremental rehearsal than with ordinary drill. The summary we read does not say how long after practice they were tested.