Page 180 - NUMINO TG_3A
P. 180
11The Magic Rods Unit
Objective: Learn how to multiply 2-digit numbers or 3-digit numbers by 1-digit numbers Have students solve the problems using
Napier’s rods.
Use Napier’s Rods to multiply. Check your answers.
3 5 35
^7
2 3
1 245
7
5
245
4 3 43
^9
3 2
387
6 9
7
387
5 6 56
^6
3 3
336
0 6
11. The Magic Rods 101
6
336
23
1 00
23
To calculate 23 7, place the two Napier’s rods, which have 2 00
numbers 2 and 3 at the top. Then, separate the pieces you 46
would need to calculate 7 2 and 7 3. Next, add the numbers
from the back. 3 00 23
Photocopy the page with a picture of Napier’s rods from the 69 12
back of this book. Then, hand it out to the students. Have them
cut it out and use it to calculate numbers. 4 01 41
82
5 11 7
05
6 11
28
161
7 12
41
8 12
64
9 12
87
3A Unit 11 163
Objective: Learn how to multiply 2-digit numbers or 3-digit numbers by 1-digit numbers Have students solve the problems using
Napier’s rods.
Use Napier’s Rods to multiply. Check your answers.
3 5 35
^7
2 3
1 245
7
5
245
4 3 43
^9
3 2
387
6 9
7
387
5 6 56
^6
3 3
336
0 6
11. The Magic Rods 101
6
336
23
1 00
23
To calculate 23 7, place the two Napier’s rods, which have 2 00
numbers 2 and 3 at the top. Then, separate the pieces you 46
would need to calculate 7 2 and 7 3. Next, add the numbers
from the back. 3 00 23
Photocopy the page with a picture of Napier’s rods from the 69 12
back of this book. Then, hand it out to the students. Have them
cut it out and use it to calculate numbers. 4 01 41
82
5 11 7
05
6 11
28
161
7 12
41
8 12
64
9 12
87
3A Unit 11 163
