Ufumbuzi - Kurudisha urefu
Maelezo kwa hatua
1. Andika tena nambari kutoka juu kwenda chini, zimepangwa kwa thamani zao za eneo
| Thamani ya mahali | alfu | mia | kumi | moja | . | kumi | mia | alfu |
| 9 | 2 | 1 | 8 | . | 9 | 8 | ||
| - | 1 | 7 | 8 | . | 6 | 2 | 1 | |
| . |
Weka sifuri katika mahali pa idadi tupu:
| Thamani ya mahali | alfu | mia | kumi | moja | . | kumi | mia | alfu |
| 9 | 2 | 1 | 8 | . | 9 | 8 | 0 | |
| - | 1 | 7 | 8 | . | 6 | 2 | 1 | |
| . |
2. Toa nambari kwa kutumia njia ndefu ya kutoa
Kwa sababu digit ya juu (0) katika safu ya alfu ni ndogo sana kupata tofauti chanya, azima 1 kutoka kwa digit (8) katika nafasi inayofuata ya namba ambayo inakuwa (7) na kupata (10).
| Thamani ya mahali | alfu | mia | kumi | moja | . | kumi | mia | alfu |
| 7 | 10 | |||||||
| 9 | 2 | 1 | 8 | . | 9 | 8 | 0 | |
| - | 1 | 7 | 8 | . | 6 | 2 | 1 | |
| . |
Toa nambari kwenye safu ya alfu kutoka kwa namba juu:
10-0-1=9
| Thamani ya mahali | alfu | mia | kumi | moja | . | kumi | mia | alfu |
| 7 | 10 | |||||||
| 9 | 2 | 1 | 8 | . | 9 | 8 | 0 | |
| - | 1 | 7 | 8 | . | 6 | 2 | 1 | |
| . | 9 |
Toa nambari kwenye safu ya mia kutoka kwa namba juu:
7-2=5
| Thamani ya mahali | alfu | mia | kumi | moja | . | kumi | mia | alfu |
| 7 | 10 | |||||||
| 9 | 2 | 1 | 8 | . | 9 | 8 | 0 | |
| - | 1 | 7 | 8 | . | 6 | 2 | 1 | |
| . | 5 | 9 |
Toa nambari kwenye safu ya kumi kutoka kwa namba juu:
9-6=3
| Thamani ya mahali | alfu | mia | kumi | moja | . | kumi | mia | alfu |
| 7 | 10 | |||||||
| 9 | 2 | 1 | 8 | . | 9 | 8 | 0 | |
| - | 1 | 7 | 8 | . | 6 | 2 | 1 | |
| . | 3 | 5 | 9 |
Toa nambari kwenye safu ya moja kutoka kwa namba juu:
8-8=0
| Thamani ya mahali | alfu | mia | kumi | moja | . | kumi | mia | alfu |
| 7 | 10 | |||||||
| 9 | 2 | 1 | 8 | . | 9 | 8 | 0 | |
| - | 1 | 7 | 8 | . | 6 | 2 | 1 | |
| 0 | . | 3 | 5 | 9 |
Kwa sababu digit ya juu (1) katika safu ya kumi ni ndogo sana kupata tofauti chanya, azima 1 kutoka kwa digit (2) katika nafasi inayofuata ya namba ambayo inakuwa (1) na kupata (11).
| Thamani ya mahali | alfu | mia | kumi | moja | . | kumi | mia | alfu |
| 1 | 11 | |||||||
| 7 | 10 | |||||||
| 9 | 2 | 1 | 8 | . | 9 | 8 | 0 | |
| - | 1 | 7 | 8 | . | 6 | 2 | 1 | |
| 0 | . | 3 | 5 | 9 |
Toa nambari kwenye safu ya kumi kutoka kwa namba juu:
11-7=4
| Thamani ya mahali | alfu | mia | kumi | moja | . | kumi | mia | alfu |
| 1 | 11 | |||||||
| 7 | 10 | |||||||
| 9 | 2 | 1 | 8 | . | 9 | 8 | 0 | |
| - | 1 | 7 | 8 | . | 6 | 2 | 1 | |
| 4 | 0 | . | 3 | 5 | 9 |
Toa nambari kwenye safu ya mia kutoka kwa namba juu:
1-1=0
| Thamani ya mahali | alfu | mia | kumi | moja | . | kumi | mia | alfu |
| 1 | 11 | |||||||
| 7 | 10 | |||||||
| 9 | 2 | 1 | 8 | . | 9 | 8 | 0 | |
| - | 1 | 7 | 8 | . | 6 | 2 | 1 | |
| 0 | 4 | 0 | . | 3 | 5 | 9 |
Andika 9 kwenye eneo la alfu.
| Thamani ya mahali | alfu | mia | kumi | moja | . | kumi | mia | alfu |
| 1 | 11 | |||||||
| 7 | 10 | |||||||
| 9 | 2 | 1 | 8 | . | 9 | 8 | 0 | |
| - | 1 | 7 | 8 | . | 6 | 2 | 1 | |
| 9 | 0 | 4 | 0 | . | 3 | 5 | 9 |
Jibu ni: 9040.359
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