1. $32 + (96 - 64) : 8 \cdot 2 = 32 + 32 : 8 \cdot 2 = 32 + 4 \cdot 2 = 32 + 8 = 40$
$32 + (96 - 64) : (8 \cdot 2) = 32 + 32 : 16 = 32 + 2 = 34$
$(32 + 96 - 64 : 8) \cdot 2 = (32 + 96 - 8) \cdot 2 = (128 - 8) \cdot 2 = 120 \cdot 2 = 240$
$(400 - 160 : 8) : 2 = (400 - 20) : 2 = 380 : 2 = 190$
$(400 - 160) : 8 : 2 = 240 : 8 : 2 = 30 : 2 = 15$
$(400 - 160) : (8 : 2) = 240 : 4 = 60$
2. $900 - 2 \cdot 50 + 140 = 900 - 100 + 140 = 800 + 140 = 940$
$600 + 90 : 3 - 200 = 600 + 30 - 200 = 630 - 200 = 430$
$700 - 25 \cdot 2 + 100 = 700 - 50 + 100 = 650 + 100 = 750$
$120 - 75 : 3 \cdot 4 + 65 = 120 - 25 \cdot 4 + 65 = 120 - 100 + 65 = 20 + 65 = 85$
$200 - 80 : 4 \cdot 5 - 35 = 200 - 20 \cdot 5 - 35 = 200 - 100 - 35 = 100 - 35 = 65$
$108 - 54 : 9 \cdot 6 + 58 = 108 - 6 \cdot 6 + 58 = 108 - 36 + 58 = 72 + 58 = 130$
3. $796 < 800$
$312 < 320$
Допущение: Нужно сравнить 1000 с 995
$1000 > 995$
4. $36 + 60 : 4 \cdot 2 + 34 = 36 + 15 \cdot 2 + 34 = 36 + 30 + 34 = 66 + 34 = 100$
$42 + 54 : 3 \cdot 2 - 18 = 42 + 18 \cdot 2 - 18 = 42 + 36 - 18 = 78 - 18 = 60$
$(760 + 100) - (430 + 230) = 860 - 660 = 200$
$(970 - 340) + (250 + 120) = 630 + 370 = 1000$
5. $624 : 6 = 104$, проверка: $104 \cdot 6 = 624$
$$\begin{array}{ccc|l} 6 & 2 & 4 & 6 \\ \hline 6 & & & 104 \\ \hline & 2 & \\ & 0 & \\ \hline & 2 & 4 \\ & 2 & 4 \\ \hline & & 0 \end{array}$$
$963 : 3 = 321$, проверка: $321 \cdot 3 = 963$
$$\begin{array}{ccc|l} 9 & 6 & 3 & 3 \\ \hline 9 & & & 321 \\ \hline & 6 & \\ & 6 & \\ \hline & & 3 \\ & & 3 \\ \hline & & 0 \end{array}$$
$482 : 2 = 241$, проверка: $241 \cdot 2 = 482$
$$\begin{array}{ccc|l} 4 & 8 & 2 & 2 \\ \hline 4 & & & 241 \\ \hline & 8 & \\ & 8 & \\ \hline & & 2 \\ & & 2 \\ \hline & & 0 \end{array}$$
$147 : 7 = 21$, проверка: $21 \cdot 7 = 147$
$$\begin{array}{cc|l} 1 & 4 & 7 & 7 \\ \hline 1 & 4 & & 21 \\ \hline & & 7 \\ & & 7 \\ \hline & & 0 \end{array}$$
$135 : 3 = 45$, проверка: $45 \cdot 3 = 135$
$$\begin{array}{ccc|l} 1 & 3 & 5 & 3 \\ \hline 1 & 2 & & 45 \\ \hline & 1 & 5 \\ & 1 & 5 \\ \hline & & 0 \end{array}$$
$825 : 5 = 165$, проверка: $165 \cdot 5 = 825$
$$\begin{array}{ccc|l} 8 & 2 & 5 & 5 \\ \hline 5 & & & 165 \\ \hline 3 & 2 & \\ 3 & 0 & \\ \hline & 2 & 5 \\ & 2 & 5 \\ \hline & & 0 \end{array}$$
$248 : 8 = 31$, проверка: $31 \cdot 8 = 248$
$$\begin{array}{ccc|l} 2 & 4 & 8 & 8 \\ \hline 2 & 4 & & 31 \\ \hline & & 8 \\ & & 8 \\ \hline & & 0 \end{array}$$
$616 : 2 = 308$, проверка: $308 \cdot 2 = 616$
$$\begin{array}{ccc|l} 6 & 1 & 6 & 2 \\ \hline 6 & & & 308 \\ \hline & 1 & \\ & 0 & \\ \hline & 1 & 6 \\ & 1 & 6 \\ \hline & & 0 \end{array}$$
6. $346 + 458 = 804$
$157 + 484 = 641$
$832 - 456 = 376$
$621 - 241 = 380$
$503 + 204 = 707$
$308 + 106 = 414$
7. $318 \cdot 3 = 954$
$247 \cdot 4 = 988$
$207 \cdot 4 = 828$
$108 \cdot 6 = 648$
$824 : 4 = 206$
$$\begin{array}{ccc|l} 8 & 2 & 4 & 4 \\ \hline 8 & & & 206 \\ \hline & 2 & \\ & 0 & \\ \hline & 2 & 4 \\ & 2 & 4 \\ \hline & & 0 \end{array}$$
$565 : 5 = 113$
$$\begin{array}{ccc|l} 5 & 6 & 5 & 5 \\ \hline 5 & & & 113 \\ \hline & 6 & \\ & 5 & \\ \hline & 1 & 5 \\ & 1 & 5 \\ \hline & & 0 \end{array}$$
$234 : 9 = 26$
$$\begin{array}{cc|l} 2 & 3 & 4 & 9 \\ \hline 1 & 8 & & 26 \\ \hline & 5 & 4 \\ & 5 & 4 \\ \hline & & 0 \end{array}$$
$632 : 8 = 79$
$$\begin{array}{cc|l} 6 & 3 & 2 & 8 \\ \hline 5 & 6 & & 79 \\ \hline & 7 & 2 \\ & 7 & 2 \\ \hline & & 0 \end{array}$$
8. Допущение: Нужно записать сумму чисел 42 и 16 и найти её.
$42 + 16 = 58$
**Ответы:** смотри выше