Question

multiplication massharpen your math skills with this exciting multiplication chaltry to solve each problem using mental math. if it gets tricky, d— take your time and check your work. youve got this$13 \times 80 = \underline{\quad\quad\quad}$$50 \times 90 = \underline{\quad\quad\quad}$$29 \times 33 = \underline{\quad\quad\quad}$$75 \times 6 = \underline{\quad\quad\quad}$$91 \times 4 = \underline{\quad\quad\quad}$$38 \times 10 = \underline{\quad\quad\quad}$$62 \times 5 = \underline{\quad\quad\quad}$$19 \times 24 = \underline{\quad\quad\quad}$$41 \times 30 = \underline{\quad\quad\quad}$$27 \times 18 = \underline{\quad\quad\quad}$$56 \times 12 = \underline{\quad\quad\quad}$$85 \times 3 = \underline{\quad\quad\quad}$$64 \times 15 = \underline{\quad\quad\quad}$$45 \times 45 = \underline{\quad\quad\quad}$$31 \times 19 = \underline{\quad\quad\quad}$$20 \times 85 = \underline{\quad\quad\quad}$$30 \times 50 = \underline{\quad\quad\quad}$$70 \times 90 = \underline{\quad\quad\quad}$$25 \times 60 = \underline{\quad\quad\quad}$$80 \times 30 = \underline{\quad\quad\quad}$$55 \times 20 = \underline{\quad\quad\quad}$$90 \times 4 = \underline{\quad\quad\quad}$

Explanation:

Step1: Calculate 13×80

$13 \times 80 = 13 \times 8 \times 10 = 104 \times 10 = 1040$

Step2: Calculate 50×90

$50 \times 90 = 5 \times 9 \times 100 = 45 \times 100 = 4500$

Step3: Calculate 29×33

$29 \times 33 = (30-1) \times 33 = 30 \times 33 - 1 \times 33 = 990 - 33 = 957$

Step4: Calculate 75×6

$75 \times 6 = (70+5) \times 6 = 70 \times 6 + 5 \times 6 = 420 + 30 = 450$

Step5: Calculate 91×4

$91 \times 4 = (90+1) \times 4 = 90 \times 4 + 1 \times 4 = 360 + 4 = 364$

Step6: Calculate 38×10

$38 \times 10 = 380$

Step7: Calculate 62×5

$62 \times 5 = 62 \times \frac{10}{2} = \frac{620}{2} = 310$

Step8: Calculate 19×24

$19 \times 24 = (20-1) \times 24 = 20 \times 24 - 1 \times 24 = 480 - 24 = 456$

Step9: Calculate 41×30

$41 \times 30 = 41 \times 3 \times 10 = 123 \times 10 = 1230$

Step10: Calculate 27×18

$27 \times 18 = 27 \times (20-2) = 27 \times 20 - 27 \times 2 = 540 - 54 = 486$

Step11: Calculate 56×12

$56 \times 12 = 56 \times (10+2) = 56 \times 10 + 56 \times 2 = 560 + 112 = 672$

Step12: Calculate 85×3

$85 \times 3 = (80+5) \times 3 = 80 \times 3 + 5 \times 3 = 240 + 15 = 255$

Step13: Calculate 64×15

$64 \times 15 = 64 \times (10+5) = 64 \times 10 + 64 \times 5 = 640 + 320 = 960$

Step14: Calculate 45×45

$45 \times 45 = (40+5)^2 = 40^2 + 2 \times 40 \times 5 + 5^2 = 1600 + 400 + 25 = 2025$

Step15: Calculate 31×19

$31 \times 19 = (30+1) \times (20-1) = 30 \times 20 - 30 \times 1 + 1 \times 20 - 1 \times 1 = 600 - 30 + 20 - 1 = 589$

Step16: Calculate 20×85

$20 \times 85 = 2 \times 85 \times 10 = 170 \times 10 = 1700$

Step17: Calculate 30×50

$30 \times 50 = 3 \times 5 \times 100 = 15 \times 100 = 1500$

Step18: Calculate 70×90

$70 \times 90 = 7 \times 9 \times 100 = 63 \times 100 = 6300$

Step19: Calculate 25×60

$25 \times 60 = 25 \times 6 \times 10 = 150 \times 10 = 1500$

Step20: Calculate 80×30

$80 \times 30 = 8 \times 3 \times 100 = 24 \times 100 = 2400$

Step21: Calculate 55×20

$55 \times 20 = 55 \times 2 \times 10 = 110 \times 10 = 1100$

Step22: Calculate 90×40

$90 \times 40 = 9 \times 4 \times 100 = 36 \times 100 = 3600$

Answer:

1. $13 \times 80 = 1040$
2. $50 \times 90 = 4500$
3. $29 \times 33 = 957$
4. $75 \times 6 = 450$
5. $91 \times 4 = 364$
6. $38 \times 10 = 380$
7. $62 \times 5 = 310$
8. $19 \times 24 = 456$
9. $41 \times 30 = 1230$
10. $27 \times 18 = 486$
11. $56 \times 12 = 672$
12. $85 \times 3 = 255$
13. $64 \times 15 = 960$
14. $45 \times 45 = 2025$
15. $31 \times 19 = 589$
16. $20 \times 85 = 1700$
17. $30 \times 50 = 1500$
18. $70 \times 90 = 6300$
19. $25 \times 60 = 1500$
20. $80 \times 30 = 2400$
21. $55 \times 20 = 1100$
22. $90 \times 40 = 3600$