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Course: Class 3>Unit 4

Lesson 4: Multiply by 10s

Multiplying 10s

Lindsay multiplies multiples of 10 by other multiples of 10, such as 30x50.

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• why do you have to have a pattern?
• Everything in math tends to have a pattern, math can be confusing at times so it is very helpful to go back to a pattern or rule to help focus and solve the question.
• An easier way to do it is to just to do for example in 50x30 do 5x3 which is 15 then make it into a thousand
• Good thought! In your 50 x 30 you will note that you have two zeros on those numbers. If you then multiply 5 x 3 to get 15 you just need to add those two zeros back on to get 1500.

There are lots and lots of "tricks" like that you will discover as you go along. Then math becomes kind of fun and easy.
• also i have another question if i were to multiply 10 would that mean it would just be counting up by tens so like if i did 2 times 10 it would be 20 cause it's in the tens place?
• Yep! you're correct :) Multiplications Tables is also adding numbers the same numbers to each other so... 10+10+10 or 5+5+5, find a Times Table Grid on Google that you like and use it to help you learn your Times Tables.

A tip to help you learn them is 2, 4, 6 and 8 Times Tables have a 5 Digit repeating number pattern from the first 5 numbers then repeats in the right side numbers. 1 at a time learn them and say the patterns to yourself, then practise them by writing the patterns then fill them in the other numbers. Eventually you won't have to use the pattern for 2 times table that much once you feel you've learned them well but you'll still need it for the rest.

2 Times Table goes... 2 4 6 8 0
4 Times Table goes... 4 8 2 6 0
6 Times Table goes... 6 2 8 4 0
8 Times Table goes... 8 6 4 2 0

3 and 7 times tables is tough to learn because it has a 10 digit number pattern but 3 times table because it's a small number it's easy to add 3+3+3 in your head but with 7 times table use the other number in your multiplication sum to help you work it out instead because it doesn't matter which way you multiply or even add two or more numbers together, it will always give you the same answer :) But remember that 7x7 is 49.
• wait so if i were to do 40 times 70 it would be 1100?
• no 7 x 4 = 28 and then add zero's it would be 2800
• 900+800=1700-700=1000+400+170=i dont know
• Do you time us?🤔
• Were are the questions?
• they have been taken
• Hi I have a lot of fun with you guys I hope you’re having fun to