27
15
12+9=21 21+15=36 36+13=49 49+6=55
by multiplying 15 and 12 twice then add up your answer and that's the perimeter
x - 12 = 3 Add '12' to both sides x = 3 + 12 x = 15
It is: (15-7)*(12-9) = 24
375
ext. 12-1=2+13=15
46. The pattern is add 3 then add 6 then add 9 then add 12 then add 15 ...
4-1=3 37+3=40 12+3=15 40 +15=55
Add up all the sides- 12+12+15+15. For the AREA, you would multiply length X width.
A number sentence for 15 and 12 can be expressed in various ways, depending on the operation you want to showcase. For example, if you want to add them, the number sentence would be 15 + 12 = 27. If you want to show subtraction, it could be 15 - 12 = 3. Alternatively, for multiplication, it would be 15 × 12 = 180.
(8/12) + (2/10) = (10/15) + (3/15) = 13/15