The manufacturer receives an order for 1000 pieces, 3/10 of the total amount is completed on the first day, and the remaining 9/10 is completed on the second day. How many pieces need to be completed on the third day to complete the entire order?
厂家接到一份订单，数量为1000个，第一天完成了总量的3/10，第二天完成剩余的9/10，第三天需要完成多少个才能完成全部订单？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">(7/10) * (9/10)</gadget>
<output>63/100 = around 0.63</output>

<gadget id="calculator">1 - (3/10) - (63/100)</gadget>
<output>7/100 = around 0.07</output>

<gadget id="calculator">1_000 * (7/100)</gadget>
<output>70</output>

<result>70</result>