# 1st Class Mathematics Back & Forth Counting Counting in Tens

Counting in Tens

Category : 1st Class

### Counting in Tens

Look at the following:

One ten       = 1 ten     = Two tens      = 2 tens    = Three tens   = 3 tens    = Ten tens       = 10 tens  = Twelve tens  = 12 tens  = Now, it is clear that,

One ten is one fold of Two tens is twofold of Three tens is three fold of Ten tens is tenfold of Twelve tens is twelve fold of Trick:

Just put a single zero (0) in place of ten   From the above given explanation, it is clear that while counting in tens, put number left side and a single zero (0) in the right side. (A) (B) Now, it is clear that counting in 10's goes as:

10, 20, 30, 40, 50, 60, 70, 80, 90, 100 ...................... so on.  Five tens = ?

(a) 40

(b) 50

(c) 60

(d) 80

Answer: (b)

Explanation

Option (B) is correct because it is clear from the following diagram:

Therefore, option (b) is correct and rest of the options is incorrect. Option: (A) is incorrect as = four tens, it is clear from the following diagram: Option: (C) is incorrect because it is equal to tens or Six tens which is clear from the following diagram: Option (D) is incorrect because it is equal to eight tens which is clear from the following diagram:  In figure (i) there are 10 balls inside a box and in figure (ii) there are also 10 balls inside another box. What will be the answer if balls in both the boxes are counted together? (a) Four tens

(b) Five tens

(c) Three tens

(d) Two tens

Answer: (d)

Explanation

While counting together the total number of balls comes to 20 and 20 = 2 fold of 10 = Two tens.

It is clear from the following diagram: Option (a) is incorrect as four tens = 4 fold of 10 = 40

It is clear from the following diagram: Option (B) is incorrect as five tens = 5 fold of 10 = 50

It is clear from the following diagram: Option (c) is incorrect as three tens = 3 fold of 10 = 30

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