mental math questions..
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1. 67×100 = 6700
2. 0.3 km
3. 7×5 > 8×5
4. 4×7 = 30 - 2
5. 35×3/7 = 15
6. 07:35 hrs
7. 4×6×500 =12000
8. 1km per min
9. 21 + 23 + 25 = 69
10. 2(l+b) = 12 & lb = 5 ,
then l(6-l) =5 , l^2-6l+5= 0 , l^2 - 5l - l + 5 = 0
(l-5)(l-1) = 0 , l = 5 & b=1
11. 2 whole 5/6
12. 24×3/4 = 18
13. 31 , 37
14. 7-y = 3, y = 7-3= 4.
15. 54/6 = 9hr.
16. 100 lakhs
17. 10000234
18. 22 × 2 = 44 km
19. angle
20. square unit . example sq.m or sq.cm
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