37.24 + 37.76 + 63 . 79 + 21 . 63
= 37 . ( 24 + 76 ) + 63 . ( 79 + 21 )
= 37 . 100 + 63 . 100
= 3700 + 6300
= 10000
a) 37.24 + 37.76 + 63.79 + 21.63
= 37.(24 + 76) + 63.(79 + 21)
= 37.100 + 63. 100
= 100.(37 +63)
= 100.100
= 10000
b) 69.113 - 27.69 + 69.14 + 31
= 69.(113 - 27 + 14) +31
= 69.100 + 31
= 6931
c) 72.121 + 27.121 + 121
= 121.(72 + 27 + 1)
= 121.100
= 12100
-51.(-72) - 72.121