Compare: 530 and 350
Compare 2300 and 3200?
Calculating the signature of the image guess, the signature of the image of the height of 8 cm and a total of 100 cm2
Compensible of a square of the bottom of 5 cm
Caculator:
S= 2+4+6+8+...+200
S=?
1 + 2 + 3 + 4 + .....+ 100