Odpowiedź:
a)
247 + 48 = 247 + 3 + 45 = 250 + 45 = 250 + 40 + 5 = 290 + 5 = 295
699 + 213 = 699 + 1 + 212 = 700 + 212 = 700 + 200 + 12 = 900 + 12 = 912
288 + 313 = 288 + 12 + 301 = 300 + 301 = 300 + 300 + 1 = 600 + 1 = 601
299 + 199 = 299 + 1 + 198 = 300 + 198 = 300 + 100 + 98 = 400 + 98 = 498
b)
38 · 4 = 30 · 4 + 8 · 4 = 120 + 32 = 120 + 30 + 2 = 150 + 2 = 152
213 · 4 = 200 · 4 + 10 · 4 + 3 · 4 = 800 + 40 + 12 = 840 + 12 = 840 + 10 + 2 = 850 + 2 = 852
55 · 6 = 50 · 6 + 5 · 6 = 300 + 30 = 330
77 · 12 = 77 · 10 + 77 · 2 = 770 + 70 · 2 + 7 · 2 = 770 + 140 + 14 = 770 + 30 + 110 + 14 = 800 + 110 + 14 = 800 + 100 + 10 + 14 = 900 + 24 = 924
23 · 15 = 20 · 15 + 3 · 15 = 300 + 45 = 345
c)
78 · 5 = 70 · 5 + 8 · 5 = 350 + 40 = 390
126 · 5 = 120 · 5 + 6 · 5 = 600 + 30 = 630
468 · 5 = 400 · 5 + 60 · 5 + 8 · 5 = 2000 + 300 + 40 = 2300 + 40 = 2340
87 · 50 = 80 · 50 + 7 · 50 = 4000 + 350 = 4350
564 · 50 = 500 · 50 + 60 · 50 + 4 · 50 = 25000 + 3000 + 200 = 28000 + 200 = 28200
d)
340 : 5 = 300 : 5 + 40 : 5 = 60 + 8 = 68
730 : 5 = 700 : 5 + 30 : 5 = 140 + 6 = 146
6800 : 50 = 680 : 5 = 600 : 5 + 80 : 5 = 120 + 16 = 136
8900 : 50 = 890 : 5 = 800 : 5 + 90 : 5 = 160 + 18 = 178
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Verified answer
Odpowiedź:
a)
247 + 48 = 247 + 3 + 45 = 250 + 45 = 250 + 40 + 5 = 290 + 5 = 295
699 + 213 = 699 + 1 + 212 = 700 + 212 = 700 + 200 + 12 = 900 + 12 = 912
288 + 313 = 288 + 12 + 301 = 300 + 301 = 300 + 300 + 1 = 600 + 1 = 601
299 + 199 = 299 + 1 + 198 = 300 + 198 = 300 + 100 + 98 = 400 + 98 = 498
b)
38 · 4 = 30 · 4 + 8 · 4 = 120 + 32 = 120 + 30 + 2 = 150 + 2 = 152
213 · 4 = 200 · 4 + 10 · 4 + 3 · 4 = 800 + 40 + 12 = 840 + 12 = 840 + 10 + 2 = 850 + 2 = 852
55 · 6 = 50 · 6 + 5 · 6 = 300 + 30 = 330
77 · 12 = 77 · 10 + 77 · 2 = 770 + 70 · 2 + 7 · 2 = 770 + 140 + 14 = 770 + 30 + 110 + 14 = 800 + 110 + 14 = 800 + 100 + 10 + 14 = 900 + 24 = 924
23 · 15 = 20 · 15 + 3 · 15 = 300 + 45 = 345
c)
78 · 5 = 70 · 5 + 8 · 5 = 350 + 40 = 390
126 · 5 = 120 · 5 + 6 · 5 = 600 + 30 = 630
468 · 5 = 400 · 5 + 60 · 5 + 8 · 5 = 2000 + 300 + 40 = 2300 + 40 = 2340
87 · 50 = 80 · 50 + 7 · 50 = 4000 + 350 = 4350
564 · 50 = 500 · 50 + 60 · 50 + 4 · 50 = 25000 + 3000 + 200 = 28000 + 200 = 28200
d)
340 : 5 = 300 : 5 + 40 : 5 = 60 + 8 = 68
730 : 5 = 700 : 5 + 30 : 5 = 140 + 6 = 146
6800 : 50 = 680 : 5 = 600 : 5 + 80 : 5 = 120 + 16 = 136
8900 : 50 = 890 : 5 = 800 : 5 + 90 : 5 = 160 + 18 = 178
Odpowiedź:
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