PREREQUISITE Give the sum or difference of the following mentally.
1. 42 + 33 =?
2. 25 + 61 =?
3. 23 + 98 =?
4. 17 - 6 =?
5. 23 - 8=?
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PREREQUISITE Give the sum or difference of the following mentally.
1. 42 + 33 =?
2. 25 + 61 =?
3. 23 + 98 =?
4. 17 - 6 =?
5. 23 - 8=?
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Answer:
PREREQUISITE Give the sum or difference of the following mentally.
1. 42 + 33 = 75
2. 25 + 61 = 86
3. 23 + 98 = 131
4. 17 - 6 = 11
5. 23 - 8= 15
Answer:
42+33=75
25+61=81
23+98=121
17-6=11
23-8=15