問題
次の$\square$に当てはまる数を求めなさい.
解説
- (1) $2024 \div 11 \div 23 = \square$
- $184\div23=$$8$
- (2) $23.72 \times 55 – 23.72 \times 45 = \square$
- $23.72\times(55-45)$
$=23.72\times10$
$=$$237.2$
- $23.72\times(55-45)$
- (3) $\dfrac{5}{6}+2\dfrac{1}{4}\times\dfrac{2}{3}= \square$
- $\dfrac{5}{6}+\dfrac{9}{4}\times\dfrac{2}{3}$
$=\dfrac{5}{6}+\dfrac{3}{2}$
$=$$2\dfrac{1}{3}$
- $\dfrac{5}{6}+\dfrac{9}{4}\times\dfrac{2}{3}$
- (4) $38\div15+2.8\times2\dfrac{2}{3} = \square$
- $\dfrac{38}{15}+\dfrac{14}{5}\times\dfrac{8}{3}$
$=\dfrac{38}{15}+\dfrac{112}{15}$
$=$$10$
- $\dfrac{38}{15}+\dfrac{14}{5}\times\dfrac{8}{3}$
- (5) $54-(12-\square)\times5+16\div4=38$
- $(12-\square)\times5=54+4-38$
$12-\square=20\div5$
$\square=8$
- $(12-\square)\times5=54+4-38$