Simple calculation of 42 + 98 × 21
42+98×21
=2×21+98×21
=21×(2+98)
=21×100
=2100
How to calculate 84 + 42 * 98
84+42*98
=42*(98+2)
=42*100
=4200
Simple calculation of 0.7 × 98
0.7×(100-2)=70-1.4=68.6