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1. \(\)Hoeveel seconden passen er in 21 uren? \(\)
2. \(\)Hoeveel seconden passen er in 79 uren? \(\)
3. \(\)Hoeveel minuten passen er in 2520 seconden?\(\)
4. \(\)Hoeveel uren passen er in 1500 minuten?\(\)
5. \(\)Hoeveel minuten passen er in 52 uren? \(\)
6. \(\)Hoeveel seconden passen er in 41 minuten? \(\)
7. \(\)Hoeveel seconden passen er in 80 minuten? \(\)
8. \(\)Hoeveel seconden passen er in 63 minuten? \(\)
9. \(\)Hoeveel seconden passen er in 81 minuten? \(\)
10. \(\)Hoeveel minuten passen er in 22 uren? \(\)
11. \(\)Hoeveel minuten passen er in 96 uren? \(\)
12. \(\)Hoeveel uren passen er in 327600 seconden?\(\)

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Verbetersleutel

1. \(21 \text{ uren}\\=21\times3600\text{ seconden}\\=75600\text{ seconden}\)
2. \(79 \text{ uren}\\=79\times3600\text{ seconden}\\=284400\text{ seconden}\)
3. \(2520 \text{ seconden}\\=2520:60\text{ minuten}\\=42\text{ minuten}\)
4. \(1500 \text{ minuten}\\=1500:60\text{ uren}\\=25\text{ uren}\)
5. \(52 \text{ uren}\\=52\times60\text{ minuten}\\=3120\text{ minuten}\)
6. \(41 \text{ minuten}\\=41\times60\text{ seconden}\\=2460\text{ seconden}\)
7. \(80 \text{ minuten}\\=80\times60\text{ seconden}\\=4800\text{ seconden}\)
8. \(63 \text{ minuten}\\=63\times60\text{ seconden}\\=3780\text{ seconden}\)
9. \(81 \text{ minuten}\\=81\times60\text{ seconden}\\=4860\text{ seconden}\)
10. \(22 \text{ uren}\\=22\times60\text{ minuten}\\=1320\text{ minuten}\)
11. \(96 \text{ uren}\\=96\times60\text{ minuten}\\=5760\text{ minuten}\)
12. \(327600 \text{ seconden}\\=327600:3600\text{ uren}\\=91\text{ uren}\)