## What is the table of 14 till 20?

Table of 14 up to 20

14 × 11 = 154 14 × 16 = 224
14 × 12 = 168 14 × 17 = 238
14 × 13 = 182 14 × 18 = 252
14 × 14 = 196 14 × 19 = 266
14 × 15 = 210 14 × 20 = 280

### What are the hardest times tables to learn?

Which Times Tables do Students Find Difficult? There’s an excellent article on today’s Guardian Datablog looking at a computer based study (with 232 primary school students) on which times tables students find easiest and difficult. Edited highlights (Guardian quotes in italics): Which multiplication did students get wrong most often? The hardest multiplication was six times eight, which students got wrong 63% of the time (about two times out of three). This was closely followed by 8×6, then 11×12, 12×8 and 8×12. The graphic shows the questions that were answered correctly the greatest percentage of times as dark blue (eg 1×12 was answered 95% correctly). Maybe unsurprisingly, 1×1 got answered the quickest (but perhaps illustrating the hazards of speed, pupils got it wrong about 10% of the time), at 2.4 seconds on average – while it was 12×9 which made them think for longest, at an average of 7.9 seconds apiece.

1. It’s quite interesting to see that this data is somewhat different to the previous graph.
2. You might have expected the most difficult multiplications to also take the longest time – however it looks as though some questions, whilst not intuitive can be worked out through mental methods (eg doing 12×9 by doing 12×10 then subtracting 12.) How did boys and girls differ? On average, boys got 32% of answers wrong, and took 4.2 seconds to answer each question.
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Girls, by contrast, got substantially fewer wrong, at 22%, but took 4.6 seconds on average to answer. Another interesting statistic – boys were more reckless and less considered with their answers! The element of competition (ie. having to answer against a clock) may well have encouraged this attitude. As you might expect, overall the 12 times table was found most difficult – closely followed by 8. The numbers furthest away from 5 and 10 (7,8,12) are also the most difficult. Is this down to how students are taught to calculate their tables – or because of the sequence patterns are less memorable? This would be a really excellent investigation topic for IGCSE, IB Studies or IB SL.

It is something that would be relatively easy to collect data on in a school setting and then can provide a wealth of data to analyse. The full data spreadsheet is also available to download on the Guardian page, If you enjoyed this post you may also like: Finger Ratio Predicts Maths Ability? – a maths investigation about finger ratio and mathematical skill.

Premier League Finances – Debt and Wages – an investigation into the finances of Premier League clubs. Essential resources for IB students: 1) Exploration Guides and Paper 3 Resources I’ve put together four comprehensive pdf guides to help students prepare for their exploration coursework and Paper 3 investigations. The exploration guides talk through the marking criteria, common student mistakes, excellent ideas for explorations, technology advice, modeling methods and a variety of statistical techniques with detailed explanations.

#### What is the table of squares till 20?

What are the first 20 square numbers? – The first 20 square numbers are: 1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144, 169, 196, 225, 256, 289, 324, 361, 400. You can see the sums that produce the first 20 square numbers below: 1 × 1 or 1² = 1 2 × 2 or 2² = 4 3 × 3 or 3² = 9 4× 4 or 4² = 16 5× 5 or 5² = 25 6× 6 or 6² = 36 7× 7 or 7² = 49 8× 8 or 8² = 64 9× 9 or 9² = 81 10× 10 or 10² = 100 11× 11 or 11² = 121 12 × 12 or 12² = 144 13× 13 or 13² = 169 14× 14 or 14² = 196 15× 15 or 15² = 225 16× 16 or 16² = 256 17× 17 or 17² = 289 18× 18 or 18² = 324 19× 19 or 19² = 361 20× 20 or 10² = 400

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#### What are the tables for 20?

What is the 20 Times Table?

20 × 1 = 20 20 × 6 = 120
20 × 2 = 40 20 × 7 = 140
20 × 3 = 60 20 × 8 = 160
20 × 4 = 80 20 × 9 = 180
20 × 5 = 100 20 × 10 = 200