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3˙—‡ -A˙ · 2–‡ 2011.3.22 9:31 PM ˘ ` 177 PDF_In 2540DPI 100LPI T
NUMINO
Activity 1 P. 102~103 Unit 12. Beat the Calculator!
1 . a. 90 b . 94 P. 108~109
c . 117 d . 104 Both Ricky and Ann can be right. Since we only
know that there are 48 legs in all and 48 can be
2 . a. 1; 138 divided by 6 or 8, there can be either 8 ants or
6 spiders.
b . 2; 141
c . 2; 220
3 . a. 135 b . 152 Activity 1 P. 110~111
1. b. 4 2 8
c . 210 d . 330
e . 18 3 54, 54 cherries c . 3 5 15
f . 39 4 156, 156 legs
d . 5 3 15
Activity 2 P. 104~105 e . 4 6 24
1 . Sample Answer f . 6 4 24
Number Multiplication Largest / The Largest / The 2 rows of 4 are equal to 8, and 4 rows of
Cards Sentence Smallest Smallest Product 2 are equal to 8 as well. The order of
2 5 3 35 2 Greatest 1 multiplying the factors does not change the
Smallest
35 product.
^2
2 . a. 3 cans b . 4 students
70
Activity 2 P. 112~114
Activity 3 P. 106~107 1 . Have students think about which order would
1 . a. 484
b . 1; 926 be faster for them to multiply.
c . 2; 860 Thomas might multiply the 3 numbers faster
e . 1, 2; 711 since 30 is easier to multiply by than 42.
2 . b. 274 3
d . 2; 2,028 2 . a. 140 b . 80 c . 60
c . 132 5
f . 2, 1; 1,892 d . 480 e . 120 f . 210
d . 252 4
21 822 meters 3. b. 2 c. 3 d. 2
274 4 . 120, 42, 180, 56, 81, 270, 420, 640
^3
822
11 600 cars Activity 3 P. 115~116
1 . 8, 1, 9
132 2 . a. 8, 6
^5 3 . a. 4, 3
660
2 1,008 families b . 6, 2, 3 c . 7, 1
b . 3, 5 c . 1, 3
252
^4
1,008
Answers 177
NUMINO
Activity 1 P. 102~103 Unit 12. Beat the Calculator!
1 . a. 90 b . 94 P. 108~109
c . 117 d . 104 Both Ricky and Ann can be right. Since we only
know that there are 48 legs in all and 48 can be
2 . a. 1; 138 divided by 6 or 8, there can be either 8 ants or
6 spiders.
b . 2; 141
c . 2; 220
3 . a. 135 b . 152 Activity 1 P. 110~111
1. b. 4 2 8
c . 210 d . 330
e . 18 3 54, 54 cherries c . 3 5 15
f . 39 4 156, 156 legs
d . 5 3 15
Activity 2 P. 104~105 e . 4 6 24
1 . Sample Answer f . 6 4 24
Number Multiplication Largest / The Largest / The 2 rows of 4 are equal to 8, and 4 rows of
Cards Sentence Smallest Smallest Product 2 are equal to 8 as well. The order of
2 5 3 35 2 Greatest 1 multiplying the factors does not change the
Smallest
35 product.
^2
2 . a. 3 cans b . 4 students
70
Activity 2 P. 112~114
Activity 3 P. 106~107 1 . Have students think about which order would
1 . a. 484
b . 1; 926 be faster for them to multiply.
c . 2; 860 Thomas might multiply the 3 numbers faster
e . 1, 2; 711 since 30 is easier to multiply by than 42.
2 . b. 274 3
d . 2; 2,028 2 . a. 140 b . 80 c . 60
c . 132 5
f . 2, 1; 1,892 d . 480 e . 120 f . 210
d . 252 4
21 822 meters 3. b. 2 c. 3 d. 2
274 4 . 120, 42, 180, 56, 81, 270, 420, 640
^3
822
11 600 cars Activity 3 P. 115~116
1 . 8, 1, 9
132 2 . a. 8, 6
^5 3 . a. 4, 3
660
2 1,008 families b . 6, 2, 3 c . 7, 1
b . 3, 5 c . 1, 3
252
^4
1,008
Answers 177
