Page:Happy-Maths-1-English.pdf/29

 ; Answers


 * Answers to Grains of Rice Page 5

How many 2’s in 100? 100/2 = 50. 50 x 1 = 50.
 * 1) 50 grams. If I grain weighs 1/2 gram, 2 grains will weigh 1gm.
 * 1) 199 times. On Day 1, she would have uttered God’s name 100 times while offering hundred grains. That would leave 9900 grains (10,000 - 100 = 9900). 9900 + 100=99. 100+99= 199.
 * 2) 100 days. 10,000 + 100= 100 days.


 * Answers to Why do We Need Big Numbers Page 11


 * 1) a) 5 b) 7 c) 6 d) 7 e)8
 * 2) Less than 5 billion years ago, or 5000 million years ago. 5,000,000,000 years ago.
 * 3) 109 crores.
 * 4) One third of a second.


 * Answer to Everyone in their place Page 13


 * 1) 900. 1945 has 9 hundreds in addition to 1 thousand, 4 tens and 5 units.
 * 2) 5. The sum or total of the three numbers is 3574.


 * Answers to Odd Fish Page 19

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 * 1) 50. To sell 50 ﬁsh, Grandpa would have to catch 100 ﬁsh on Day 1. The odd ones went back into the river.
 * 2) Less. He threw back 49 ﬁsh. 50 ﬁsh went into the basket.
 * 3) They are prime numbers. 2 can be divided by 1 and 2. 3 can be divided by 1 and 3. Four can be divided by 1, 2, and 4. 4 is not a Prime number.