Page 144 - New Medley 4 Semester 1

D E F
8 24 40 56 16 24 48 56 32 40 48 56

9 25 41 57 17 25 49 57 33 41 49 57
10 26 42 58 18 26 50 58 34 42 50 58

11 27 43 59 19 27 51 59 35 43 51 59
12 28 44 60 20 28 52 60 36 44 52 60

13 29 45 61 21 29 53 61 37 45 53 61
14 30 46 62 22 30 54 62 38 46 54 62

15 31 47 63 23 31 55 63 39 47 55 63

Hint: Find the sum of first numbers in the tables in which the number appears
mentally.

MATHS LAB ACTIVITY • Experiential Learning

Subtracting a smaller five-digit number from a greater five-digit number (without
borrowing) using abacus.

Requirements: Two five-pin spike abacuses; nine rings each of yellow, blue,
red and green colours; and a pack of cards with subtraction sums (without
borrowing)

Instruction:

1. Pick a card with subtraction sum from the pack.

2. Read the number on the top and represent it on the four pin abacus.

3. Read the number below it.

ZZ ZRead the digit at one’s place. Take out as many green rings on the spike
marked ‘O’.

ZZ ZRead the digit at ten’s place. Take out as many red rings on the spike marked
‘T’.

ZZ ZRead the digit at hundred’s place. Take out as many blue rings on the
spike marked ‘H’.

ZZ ZRead the digit at thousand’s place. Take out as many yellow rings on the
spike marked ‘Th’.

142