Use multiplication and the distributive property to find the quotient
54÷3=

By working out 54/ 3 you either do the best stop method, how many time does 3 go into 5 which is once and you carry over the 2, making the 4 and 24 and then how many times does 3 go into 24? and the answer is 8. then you look at the total which should be 18.

or you could have a longer method and work your way up from
1x3=3
2x3=6
3x3=9
3x4=12
3x5=15
3x6=18
3x7=21
3x8=24
3x9=27
3x10=30
3x11=33
3x12=36
3x13=39
3x14=42
3x15=45
3x16=48
3x17=51
3x18=54

and just stop once you get your answer.

Okay so for every triangle has three angles that always add up to 180 degrees. and to tell the difference between whether they are secure, right or obtuse is that acute: has one angle that is less than 90 degrees. right triangle means there is at least one angle that is exactly 90 degrees. and an obtuse angle has an angle that is bigger than 180 degrees. i’ll do #13 as an example: 13. 40 and 50 so if every triangle has 180 degrees 40+50= 90 degrees then180-90= 90 degrees so the third angle is 90 degrees and because this triangle has a 90 degree angle it means it is a right triangle