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break the seven into to numbers (3 and 4 because 3+4=7) Mulitply both of these numbers by 3 3x3=9 4x3=12 Then add together the products of the two numbers 12+9=21 example for 8x5: 4+4=8 4x5=20 4x5=20 20+20=40 Hope this helps
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∙ 15y ago
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How can you use multiplication facts about 1 and 2 to find 3x7?
1 x 7 plus 2 x 7 is the same as 3 x 7
What is the property of 3x7 plus 2 equals 3x7 plus 3x2?
3(7 + 2) = 3x7 + 3x2 is an example of the distributive law.The distributive law connects multiplication and addition.
How can you use 3x7 to find 6x7?
if you do 3x7 and you need to get 6x7 then just do it 2 times
What does 3x7 equal?
3x7 = 21
What is the derivative -1divided by 3 times x7 plus 2x-9?
y = -1/(3x7 + 2x - 9)y = -(3x7 + 2x - 9)-1y' = -(-1)(3x7 + 2x - 9)-2(3x7 + 2x - 9)'y' = (3x7 + 2x - 9)-2(21x6 + 2)y' = (21x6 + 2)/(3x7 + 2x - 9)2
What multiplication facts have a product of 21?
21x1 and 3x7
How can you use multiplication facts about 1 and 2 to find 3x7?
1 x 7 plus 2 x 7 is the same as 3 x 7
How can you use 1s and 2s facts to find 3x7?
I think 7x3 is = to 21
What is the property of 3x7 plus 2 equals 3x7 plus 3x2?
3(7 + 2) = 3x7 + 3x2 is an example of the distributive law.The distributive law connects multiplication and addition.
How can you use 3x7 to find 6x7?
if you do 3x7 and you need to get 6x7 then just do it 2 times
How can you use 2x7 equals 14 to find 3x7?
2x7 = 14 x7 = 7 3x7 = 3*7 = 21
What does 3x7 equal?
3x7 = 21
What is the derivative -1divided by 3 times x7 plus 2x-9?
y = -1/(3x7 + 2x - 9)y = -(3x7 + 2x - 9)-1y' = -(-1)(3x7 + 2x - 9)-2(3x7 + 2x - 9)'y' = (3x7 + 2x - 9)-2(21x6 + 2)y' = (21x6 + 2)/(3x7 + 2x - 9)2
What games do you get the most stickers on first in math?
well.. i would play 1.) grand slam add & subtract, multiplication & division, and all star 2.) pundis puzzle 3.) equal time 4.) equal pay well.. enjoy and also try to complete all f the just the facts and skill sets. :D
How do you Simplify 21?
3x7
What does is 3x7 equal?
21
What is the answer to 3x7?
-21
