MULTIPLICATION TIPS FOR CHILDREN - BY KEY STAGE TWO.COM
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Written by: kayemcardle
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Date: Thu, 16 Jun 2011 |
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-Multiplying by five
Here is an easy way to find an answer to a 5 times question. If you are multiplying 5 times an even number: halve the number you are multiplying by and place a zero after the number. Example: 5 ? 6, half of 6 is 3, add a zero for an answer of 30. Another example: 5 ? 8, half of 8 is 4, add a zero for an answer of 40.
If you are multiplying 5 times an odd number: subtract one from the number you are multiplying, then halve that number and place a 5 after the resulting number. Example: 5 ? 7: -1 from 7 is 6, half of 6 is 3, place a 5 at the end of the resulting number to produce the number 35. Another example: 5 ? 3: -1 from 3 is 2, half of 2 is 1, place a 5 at the end of this number to produce 15.
To square a number that ends in 5, multiply the tens digit by (itself+1), then append 25. For example: to calculate 25 ? 25, first do 2 ? 3 = 6, then append 25 to this result; the answer is 625. Other examples: 55 x 55; 5 ? 6 = 30, answer is 3025. You can also square three digit numbers this way, by starting with the the first two digits: 995 x 995; 99 ? 100 = 9900, answer is 990025.
-Multiplying by nine
To multiply by nine on your fingers, hold up ten fingers - if the problem is 9 ? 8 you just put down your 8 finger and there's your answer: 72. (If the problem is 9 ? 7 just put down your 7 finger: 63.)
When you are multiplying by 9, on your fingers (starting with your thumb) count the number you are multiplying by and hold down that finger. The number of fingers before the finger held down is the first digit of the answer and the number of finger after the finger held down is the second digit of the answer.
Example: 2 ? 9. your index finder is held down, your thumb is before, representing 1, and there are eight fingers after your index finger, representing 18.
When you multiply a number times 9, count back one from that number to get the beginning of your product. (5 ? 9: one less than 5 is 4). To get the rest of your answer, just think of the add fact families for 9:
1 + 8 = 9 2 + 7 = 9 3 + 6 = 9 4 + 5 = 9
8 + 1 = 9 7 + 2 = 9 6 + 3 = 9 5 + 4 = 9
5 ? 9 = 4_. Just think to yourself: 4 + _ = 9 because the digits in your product always add up to 9 when one of the factors is 9. Therefore, 4 + 5 = 9 and your answer is 45!
It is now possible for your child to learn on-line, in a safe and fun environment. Key Stage Two is an internet based learning tool designed to build and grow your child's education in line with the topics they will cover at school.
Do you want to include National Curriculum compliant education into your child's fun learning? KeyStageTwo.com is currently working with 35 schools across the British Isles to offer cost reducing benefits to schools across the Uk, and is in talks with various government agencies to have the system installed on a national level within the UK.
Key Stage Two is an affordable education system which integrates education with entertainment by linking education with fun online games which test the child while they learn. We have recorded great results with children spending on average 40 minutes per evening on the system, doing homework and usually additional tests, hence improving the acuity and performance of even the most hard to reach pupil.
The system has identified the following benefits to schools:
-Overall School Cost Reduction due to less homework needing printed it saves money
-Very low price means it is affordable for all schools as well as home tutors
-Teacher Time Reduction due to the reduced amount of marking
-Non Discriminatory, offering facilities to aid children who do not have home computers
-Environmentally friendly reducing your need for printing
-It helps schools meet their own IT targets
-Full Customer Support team in place meaning any queries are dealt with.
-There is a marked Improvement in Children's performance particularly those who are hard to engage through traditional methods
-Tracking of Child Performance provided by the system enables constructive lesson support, identifying particular areas of weakness in particular pupils as well as the class as a whole.
Why not lobby a school near you to get involved? Or as a parent/tutor avail of the system for only ten pounds per month. Contact us direct on 028 91 464851 or Click the link below for more information.
http://www.KeyStageTwo.com
Source: MULTIPLICATION TIPS FOR CHILDREN - BY KEY STAGE TWO.COM
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