Questions tagged [multiplication-table]

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3
votes
2answers
210 views

How many hours / school years does it take for the average child to memorize the $10\times 10$ addition and multiplication tables?

How many hours does it take for the average child to memorize the $10\times 10$ addition table? How many school years does it take for the average child to memorize the $10 \times 10$ addition table? ...
8
votes
1answer
159 views

Multiplying two decimals using (camouflaged) binary representation

This post is largely copied from a response to the 17 Camels Trick MO posting. Here I ask: Q. Does anyone (in any country) teach this binary method of decimal multiplication? It strikes me ...
9
votes
4answers
313 views

Arguments against multiplication by 'stacking'

A 8th grade student I was working with recently was faced with squaring 37 in a problem that they were working on. The student stared down the numbers for some time, and then came up with some ...
7
votes
1answer
288 views

Why are times tables thought to be important?

This question was inspired by a different question on this site which asked by what grade times tables had to be learned. The consensus seemed to be that it is essential that you learn basic times ...
13
votes
4answers
20k views

When should a kid have memorized the multiplication table?

To contextualize: I know someone who is ten years old, and needed to use repeated addition to compute $4 \times 8$, i.e., needed to calculate it as $4 \times 8 = 8+8+8+8$. Question: By what age ...
4
votes
1answer
152 views

Adult pupils with multiplication problems

I am trying to help some adults who have not practiced mental arithmetic for decades, but now they have a need for various reasons. I have noticed that they are considerably uneven: $2\times4$, $6\...
5
votes
3answers
302 views

Strategies for x8 multiplication

I am creating an app for multiplication learning/practice. During practice students get hints if they do not answer the question within some time or if they provide a wrong answer. These hints are ...
7
votes
3answers
156 views

Looking for a tool to create a digital multiplication quiz

I'm looking for some site or software which can help me create an easy, digital multiplication quiz for my students. Some things which need to be included: The student need to be able to type in the ...
10
votes
7answers
1k views

How to teach quick multiplication and division in head?

I recently started giving maths lessons and it seems like I am at my wits end. My own background is: I'm a masters student in physics, already did several tutorials for younger students, especially ...
15
votes
2answers
3k views

Teaching 100 x 100 times tables

First, why bother: I teach and play math with my son in the mornings. It's a lot about letting him enjoy learning, so the curriculum (my intentionally vague vision of how we'll proceed) is flexible. ...
28
votes
10answers
2k views

What are the arguments for and against learning multiplication table by heart?

I think, a lot of students are bothered by learning multiplication tables by heart, in particular when it comes to numbers greater than 10. Why should one learn (or not learn) these things by heart?