Question

thinking back
add.

1. $\

$$\begin{aligned} 46\\\\ +\\ 89\\end{aligned}$$

$

1. $\

$$\begin{aligned} 129\\\\ +\\ 431\\end{aligned}$$

$

1. $\

$$\begin{aligned} 16.28\\\\ +\\ 7.05\\end{aligned}$$

$

1. $\

$$\begin{aligned} 1,538.947\\\\ +\\ 943.836\\end{aligned}$$

$

1. $\

$$\begin{aligned} 3\\\\ 8\\\\ 7\\\\ 2\\\\ 6\\\\ +\\ 4\\end{aligned}$$

$

1. $\

$$\begin{aligned} 7\\\\ 2\\\\ 11\\\\ 6\\\\ 9\\\\ +\\ 8\\end{aligned}$$

$

1. $\

$$\begin{aligned} 9\\\\ 1\\\\ 6\\\\ 3\\\\ 12\\\\ +\\ 28\\end{aligned}$$

$

1. $\

$$\begin{aligned} 22\\\\ 67\\\\ 48\\\\ 73\\\\ 42\\\\ +\\ 66\\end{aligned}$$

$
subtract.

1. $\

$$\begin{aligned} 28\\\\ -\\ 13\\end{aligned}$$

$

1. $\

$$\begin{aligned} 196\\\\ -\\ 72\\end{aligned}$$

$

1. $\

$$\begin{aligned} 1,074\\\\ -\\ 809\\end{aligned}$$

$

1. $\

$$\begin{aligned} 67,432\\\\ -\\ 59,536\\end{aligned}$$

$

1. $\

$$\begin{aligned} 4.006\\\\ -\\ .817\\end{aligned}$$

$

1. $\

$$\begin{aligned} 16.19\\\\ -\\ 2.78\\end{aligned}$$

$

1. $\

$$\begin{aligned} 219.389\\\\ -\\ 1.275\\end{aligned}$$

$

1. $\

$$\begin{aligned} 64.7\\\\ -\\ 39.1\\end{aligned}$$

$
multiply.

1. $\

$$\begin{aligned} 4,387\\\\ \\times\\ 92\\end{aligned}$$

$

1. $\

$$\begin{aligned} 15,895\\\\ \\times\\ 462\\end{aligned}$$

$

1. $\

$$\begin{aligned} 8,743\\\\ \\times\\ 1,982\\end{aligned}$$

$

1. $\

$$\begin{aligned} 20,000\\\\ \\times\\ 426\\end{aligned}$$

$

1. $\

$$\begin{aligned} 754\\\\ \\times\\ 982\\end{aligned}$$

$

1. $\

$$\begin{aligned} 1,302\\\\ \\times\\ 509\\end{aligned}$$

$

1. $\

$$\begin{aligned} 5,754\\\\ \\times\\ 600\\end{aligned}$$

$

1. $\

$$\begin{aligned} 84\\\\ \\times\\ 99\\end{aligned}$$

$

Explanation:

Step1: Solve addition problems

1. $46 + 89 = 135$
2. $129 + 431 = 560$
3. $16.28 + 7.05 = 23.33$
4. $1,538.947 + 943.836 = 2,482.783$
5. $3 + 8 + 7 + 2 + 6 + 4 = 30$
6. $7 + 2 + 11 + 6 + 9 + 8 = 43$
7. $9 + 1 + 6 + 3 + 12 + 28 = 59$
8. $22 + 67 + 48 + 73 + 42 + 66 = 318$

Step2: Solve subtraction problems

1. $28 - 13 = 15$
2. $196 - 72 = 124$
3. $1,074 - 809 = 265$
4. $67,432 - 59,536 = 7,896$
5. $4.006 - 0.817 = 3.189$
6. $16.19 - 2.78 = 13.41$
7. $219.389 - 1.275 = 218.114$
8. $64.7 - 39.1 = 25.6$

Step3: Solve multiplication problems

1. $4,387 \times 92 = 4,387 \times (90 + 2) = 394,830 + 8,774 = 403,604$
2. $15,895 \times 462 = 15,895 \times (400 + 60 + 2) = 6,358,000 + 953,700 + 31,790 = 7,343,490$
3. $8,743 \times 1,982 = 8,743 \times (2,000 - 18) = 17,486,000 - 157,374 = 17,328,626$
4. $20,000 \times 426 = 8,520,000$
5. $754 \times 982 = 754 \times (1,000 - 18) = 754,000 - 13,572 = 740,428$
6. $1,302 \times 509 = 1,302 \times (500 + 9) = 651,000 + 11,718 = 662,718$
7. $5,754 \times 600 = 3,452,400$
8. $84 \times 99 = 84 \times (100 - 1) = 8,400 - 84 = 8,316$

Answer:

1. 135
2. 560
3. 23.33
4. 2,482.783
5. 30
6. 43
7. 59
8. 318
9. 15
10. 124
11. 265
12. 7,896
13. 3.189
14. 13.41
15. 218.114
16. 25.6
17. 403,604
18. 7,343,490
19. 17,328,626
20. 8,520,000
21. 740,428
22. 662,718
23. 3,452,400
24. 8,316