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16 a 12 800 + 4325 b 2000 – 1264 c 4 • 300 d 1200 : 3<br />
Margar lausnir<br />
17 a 1 • 10 = ____ 10 2 • 10 = ____ 20 4 • 10 = ____ 40 7 • 10 = ____ 70 3 • 10 = ____ 30<br />
5 • 10 = ____ 50 8 • 10 = ____ 80 6 • 10 = ____ 60 9 • 10 = ____ 90 10 • 10 = ____ 100<br />
Öll svörin enda á 0<br />
b<br />
Það bætist 0 aftan við tölu sem er margfölduð með 10<br />
18 a 2 • 100 = ____ 200 c 15 • 100 = ____ 1500 e 18 • 100 = ____ 1800 g 90 • 100 = ____ 9000<br />
b 7 • 100 = ____ 700 d 51 • 100 = ____ 5100 f 40 • 100 = ____ 4000 h 10 • 100 = ____ 1000<br />
i<br />
Það bætast tvö 0 aftan við tölu sem er margfölduð með 100<br />
Bls. 32<br />
19 a 5 • 5 = _____ 25 8 • 2 = _____ 16 6 • 4 = _____ 24 4 • 9 = _____ 36 3 • 12 = _____ 36<br />
50 • 5 = _____ 250 8 • 20 = _____ 160 6 • 40 = _____ 240 40 • 9 = _____ 360 30 • 12 = _____ 360<br />
Við svör í efri línu bætist núll við í neðri línu<br />
20<br />
• 10 20 30 40 50 60 70 80 90 100<br />
1<br />
2<br />
10<br />
20<br />
20<br />
40<br />
30<br />
60<br />
40<br />
80<br />
50<br />
100<br />
60<br />
120<br />
70<br />
140<br />
80<br />
160<br />
90<br />
180<br />
100<br />
200<br />
3 30 60 90 120 150 180 210 240 270 300<br />
4 40 80 120 160 200 240 280 320 360 400<br />
5<br />
6<br />
7<br />
8<br />
50<br />
60<br />
70<br />
80<br />
100<br />
120<br />
140<br />
160<br />
150<br />
180<br />
210<br />
240<br />
200<br />
240<br />
280<br />
320<br />
250<br />
300<br />
350<br />
400<br />
300<br />
360<br />
420<br />
480<br />
350<br />
420<br />
490<br />
560<br />
400<br />
480<br />
560<br />
640<br />
450<br />
540<br />
630<br />
720<br />
500<br />
600<br />
700<br />
800<br />
9<br />
10<br />
90<br />
100<br />
180<br />
200<br />
270<br />
300<br />
360<br />
400<br />
450<br />
500<br />
540<br />
600<br />
630<br />
700<br />
720<br />
800<br />
810<br />
900<br />
900<br />
1000<br />
21 a 8 • 50 = ____ 400 d ____ 80 • ____ 80 = 640 g 720 = 90 • ____ 8<br />
b ____ 40 • 4 = 160 e ____ 8 • ____ 40 = 320 h 560 = 8 • ____ 70<br />
c 7 • ____ 70 = 490 f ____ 4 • ____ 80 = 320 i 420 = ____ 6 • ____ 70<br />
<strong>Geisli</strong> <strong>1B</strong> – Lausnir – © Námsgagnastofnun 2011 – 09073<br />
..... Reikniaðgerðir<br />
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