Số ?

\(\frac{1}{4}\) dm2 3 cm2 = ……… cm2

\(\frac{2}{3}\) giờ 32 phút = ……… phút22222222

168 413 + 250 930

..............................................

..............................................

..............................................

..............................................

183 251 – 169 061

..............................................

..............................................

..............................................

..............................................

436 155 × 28

..............................................

..............................................

..............................................

..............................................

..............................................

..............................................

..............................................

845 207 : 27

..............................................

..............................................

..............................................

..............................................

..............................................

..............................................

..............................................

    2 × 456 – 2 × 156 + 5 231

= …………………………………

= …………………………………

= …………………………………

   2 667 + 590 – 567 + 310

= …………………………………

= …………………………………

= …………………………………^22222222

\(\frac{{39}}{{45}}\) + \(\frac{{13}}{{15}}\) = ………………………………

\(\frac{{21}}{{18}}\) – \(\frac{{10}}{9}\) = ………………………………

9 × \(\frac{5}{{63}}\) = ………………………………

\(\frac{1}{7}\) : \(\frac{5}{{28}}\) = ………………………………