# WATCH: Genius maths hacks: Multiplying teen numbers

The easiest way to work out 19x19...
Bashiera Parker

By the end of grade 4, sometimes grade 3, kids are expected to learn and know their times tables off by heart. It’s usually only the 1 to 12 times tables, but considering that’s over 140 combinations to memorise in the early stages of primary school, we can’t help but wish there was an easier way to work out your times tables if they happen to slip your mind. With that we created our genius maths hacks series.

Our latest video (scroll up to see), multiplying teen numbers, was inspired by a hack sent in by one of our readers, Jack Greenblatt.

“Say 19x18,” he started.
“Do 19+8=27 then add a 0 on the end. Thus 270
Then take the two end units and multiply them. 9x8=72
Then 270+72=342.
Can be done for 11x11 right up to 19x19.”

via GIPHY

### Chat back

Do you have any other maths hacks? Tell us and we could share it with our readers?

### Also see:

We live in a world where facts and fiction get blurred
In times of uncertainty you need journalism you can trust. For 14 free days, you can have access to a world of in-depth analyses, investigative journalism, top opinions and a range of features. Journalism strengthens democracy. Invest in the future today. Thereafter you will be billed R75 per month. You can cancel anytime and if you cancel within 14 days you won't be billed.
Voting Booth
What are your thoughts on the possibility of having permanent Stage 2 or 3 load shedding?
Please select an option Oops! Something went wrong, please try again later.
Results
I'll take that over constant schedule changes
Why are we normalising Eskom’s mess?
Vote
Podcasts
Rand - Dollar
17.66
-1.0%
Rand - Pound
21.24
-0.9%
Rand - Euro
18.94
-0.1%
Rand - Aus dollar
12.15
-0.5%
Rand - Yen
0.13
-0.1%
Platinum
970.40
-0.3%
1,602.79
-1.8%
Gold
1,866.09
-0.3%
Silver
22.23
-0.6%
Brent Crude
79.94
-2.8%
Top 40
73,489
-0.8%
All Share
79,583
-0.8%
Resource 10
74,088
-1.5%
Industrial 25
103,121
-0.3%
Financial 15
16,377
-1.1%
All JSE data delayed by at least 15 minutes
Editorial feedback and complaints

Contact the public editor with feedback for our journalists, complaints, queries or suggestions about articles on News24.