دانلود اپلیکیشن
1 جمع و تفریق های زیر را ذهنی حساب کنید.
\(\begin{array}{l}22,000 + 45,000 = \\\\4200 + 3700 = \\\\70,000 - 50,000 = \\\\8,000 - 3,000 = \\\\720,000 + 209,000 = \end{array}\)
\(\begin{array}{l}22,000 + 45,000 = 67,000\\\\4200 + 3700 = 7900\\\\70,000 - 50,000 = 20,000\\\\8,000 - 3,000 = 5,000\\\\720,000 + 209,000 = 929,000\end{array}\)
2 ضرب های زیر را ذهنی حساب کنید.
\(\begin{array}{l}4 \times 3000 = \\\\700 \times 80 = \\\\800 \times 200 = \\\\400 \times 500 = \end{array}\)
\(\begin{array}{l}4 \times 3000 = 12,000\\\\700 \times 80 = 56,000\\\\800 \times 200 = 160,000\\\\400 \times 500 = 200,000\end{array}\)
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