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E:\Working\Orange_Education\Math_Genius_1\Open_Files\Chap_6
\ 04-Oct-2025 Bharat Arora Proof-8 Reader’s Sign _______________________ Date __________
BIGGER NUMBERS oN AN ABACUS Practice Time 6B
We know that a two-spiked abacus is used to A spike cannot have
represent a 2-digit number. more than 9 beads. 1. Write the number shown on the abacus.
Let us show the number 59 on the abacus. (a) (b) (c) (d)
It has 5 tens and 9 ones. t O
So, we put 9 beads on the ones spike and 5 beads 5 9
on the tens spike as shown. t O t O t O t O
WhAT CoMES AfTER, BEfoRE oR BETWEEN
Look at the table below. 2. Draw beads to show the given number on the abacus.
Before Between After (a) (b) (c) (d)
The number that The number in The number that
comes just before is between is one less comes just after is
always 1 less than the than the next number always 1 more than the t O t O t O t O
given number. and one more than the given number. 4 9 7 1 8 8 9 5
previous number. 3. Write before, after or between to complete the following sentences.
65 –1 66 +1 67 (a) 39 comes just __________ 38.
Look at the number line. (b) 71 comes just __________ 72. Knowledge Desk
Before After • One is the only number whose letters
(c) 96 comes __________ 95 and 97. are in reverse alphabetical order.
64 65 66 67 68 69 70 (d) 79 comes __________ 78 and 80. • FOrty is the only number whose
Between letters are in alphabetical order.
65 comes just before 66 (65 is 1 less than 66). (e) 19 comes just __________ 20.
67 comes just after 66 (67 is 1 more than 66). Challenge Question (f) 57 comes just __________ 58.
So, 66 lies between 65 and 67. Identify the number that comes (g) 82 comes just __________ 81. Get it right!
between 70 and 68. l The number 83 comes just before
(h) 90 comes just __________ 89.
Think Tank #Logical Thinking 82 84 3
What number between 60 to 69 has a digit in the ones place that is 1 more than the digit in the tens place? 4. Fill in the blanks with the correct number. l The number 99 comes just after
Tens Ones (a) __________ comes just before 50. 100 98 3
(b) __________ comes just after 69.
Also, write the numbers between which the above number lies.
(c) 48 comes between __________ and __________.
(d) 75 comes just before __________.
Teacher’s Using a tailor/number tape, explain what comes just before, just after a number or what comes between two (e) 90 comes just after __________.
Tip numbers. (f) __________ comes between 80 and 82.
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