Entry Nº 029Stage 2 · Grades 3–4数与代数

常见数量关系

单价×数量=总价，速度×时间=路程——反复出现的乘法模型。

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Definition

许多问题共享同一副骨架：每份数 × 份数 = 总数。它穿上不同的衣服，就成了单价×数量=总价、速度×时间=路程、工作效率×时间=工作总量。认出骨架，问题就解了一半。

See it

Track lengthmClock 0.0 sSet all timessSet all speedsm/s

Ruler

Drag a character to move and measure: the drag direction sets the travel direction; distance, time and speed fill in on release；The value marked “auto” is computed from the other two; edit it to switch which one is solved

Click the avatar to upload a photo (long-press to reset); click the vehicle to switch (sets its speed, long-press to reset); click the position number to type a position; ◀ ▶ turns in place

Distance

Time

Speed

auto

m/s