Answer:
4. 6.6
1. 9043
2. 0.52
Step-by-step explanation:
3+2.24+1.36=6.6
10000-957
1.3-0.78
C. 224
10x8=80, 80/2=40, 40x4(all triangles)=160
8x8(square)=64
160+64=224
1. 30
2. 40
3. 70
4. 200
5. 220
6. 300
7. 8,100
8. 120
9.650
10. 2,200
11.6,000
12. 7,000
13. 1,560,000
14.1,000
Answer:
The answer for me would be B
Step-by-step explanation:
Math you do in your head
example you can do 10 tiemes 3=30 in your head
that is mental math
you might have a hard time doig 19 times 23 so you would use a calulator then it would not be mental math
it's helpful if at the supermarket or at a resaurant
mental math is math done in the mind