從數字 \(13\) 開始順數,第 \(3\) 個數字是甚麼?它是一個奇數還是偶數?
Primary School · Mathematics
Odd and Even numbers, Counting onwards & backwards: Practice Questions
2 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Odd and Even numbers, Counting onwards & backwards.
從數字5開始,順數5次,每次加上1。
在這些順數出來的數字中,共有多少個偶數?
請從數字 \(11\) 開始倒數,數 \(4\) 個數字後,到達的數字是多少?這個數字是奇數(單數)還是偶數(雙數)?
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小華從數字 \(95\) 開始。他首先順數,每次跳 \(5\) 個數字,總共跳了 \(4\) 次,到達數字 \(A\)。接著,他從數字 \(A\) 開始倒數,每次跳 \(7\) 個數字,總共跳了 \(5\) 次,到達數字 \(B\)。請問數字 \(B\) 是多少?這個數字是奇數(單數)還是偶數(雙數)?
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小明從數字 \(85\) 開始,每次順數 \(3\),重複數了 \(15\) 次,得到數字 \(A\)。請問數字 \(A\) 是多少?它是奇數還是偶數?
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有一列玩具火車共有 \(10\) 個車廂,車廂上分別印有 \(1\) 至 \(10\) 的編號。
a) 請寫出這列火車中,所有編號是雙數(偶數)的車廂。
b) 小明從火車的最後一個車廂開始數起,請由 \(10\) 號車廂開始倒數至 \(1\) 號,並寫出這組序列。
c) 在這些車廂編號中,找出所有大於 \(5\) 的單數(奇數)。
d) 如果小明從第 \(3\) 號車廂開始,往後順數 \(4\) 個編號,他會數到第幾號車廂?這個編號是單數還是雙數?
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小明正在整理書架上的圖書編號,編號範圍是從 \(55\) 至 \(72\)。
a) 請由 \(72\) 開始倒數至 \(64\),並寫出這組序列。
b) 在 \(55\) 至 \(72\) 之間(包括 \(55\) 和 \(72\)),找出所有奇數,並把它們由小到大排列出來。
c) 如果小明只挑選編號是偶數且大於 \(60\) 的圖書,請列出這些圖書的編號。
d) 小明由 \(55\) 開始順數,每隔兩個數字取一個(例如:取 \(55\) 後,跳過 \(56\) 和 \(57\),取 \(58\))。寫出前四個被取出的編號,並判斷第四個編號是奇數還是偶數。
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