与えられた計算の空欄に当てはまる数字を答える問題です。 (1) $\Box + 15 = 60$ (2) $\Box - 14 = 70$ (3) $\Box \times 16 = 80$ (4) $\Box \div 12 = 8$ (5) $25 \times 28 = (25 \times \Box) \times 7$ (6) $99 \times 13 = (\Box - 1) \times 13$

1. 問題の内容

与えられた計算の空欄に当てはまる数字を答える問題です。

(1) $\Box + 15 = 60$

(2) $\Box - 14 = 70$

(3) $\Box \times 16 = 80$

(4) $\Box \div 12 = 8$

(5) $25 \times 28 = (25 \times \Box) \times 7$

(6) $99 \times 13 = (\Box - 1) \times 13$

2. 解き方の手順

(1)

$\Box + 15 = 60$

$\Box = 60 - 15$

$\Box = 45$

(2)

$\Box - 14 = 70$

$\Box = 70 + 14$

$\Box = 84$

(3)

$\Box \times 16 = 80$

$\Box = 80 \div 16$

$\Box = 5$

(4)

$\Box \div 12 = 8$

$\Box = 8 \times 12$

$\Box = 96$

(5)

$25 \times 28 = (25 \times \Box) \times 7$

$25 \times 28 = 25 \times (\Box \times 7)$

$28 = \Box \times 7$

$\Box = 28 \div 7$

$\Box = 4$

(6)

$99 \times 13 = (\Box - 1) \times 13$

$99 = \Box - 1$

$\Box = 99 + 1$

$\Box = 100$

3. 最終的な答え

(1) 45

(2) 84

(3) 5

(4) 96

(5) 4

(6) 100