Answer:
1. +
2. x
3. -
4. +
5. x
1. (50 x6.8)+ 4.5
= 340 + 4.5
= 344.5
2. 6 x 800 ➗ 42 + 68
= 4800➗42
= 114.29 + 68
= 182.29
3. 400 x 4 ➗ 300 ➗ 35 + 90
= 1600 ➗ 300 ➗ 35 + 90
= 5.33 ➗ 35+90
= .15 + 90
= 90.15
4. 3 x 15.2 + 11.7 ➗ 0.8 + 1.24
=45.6+ 11.7 ➗ 0.8 + 1.24
= 57.3 ➗0.8 +1.24
= 71.625+ 1.24
= 72.865
5. 690 ➗ 18 + 6.5(20-80➗4)
= 690➗18 + 6.5 (0)
=38.33+ 6.5 (0)
=44.83 (0)
= 44.83
