Math Lab
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Decimal Place Value

Decimals · Class VII

Build a decimal from its tens, ones, tenths and hundredths digits.

1
type a value
09
2
type a value
09
3
type a value
09
4
type a value
09
Live values
  • Decimal value12.34
  • x 10123.4
  • x 1001,234
Live readout
Decimal value12.34
x 10123.4
x 1001,234
Tens1
Ones2
Tenths3
Hundredths4

Formulas in this lab

  • Decimal value
    10t+o+a10+b10010t + o + \tfrac{a}{10} + \tfrac{b}{100}
  • x 10
    10 x10\,x
  • x 100
    100 x100\,x
Tip: Multiplying by 10 moves every digit one place to the left.

Frequently asked questions

▶How do I read a decimal number like 12.34?

Each digit has a place value. In 12.34, the 1 is tens (10), the 2 is ones (2), the 3 is tenths (0.3) and the 4 is hundredths (0.04). Add them up: 10 + 2 + 0.3 + 0.04 = 12.34.

▶How do I use the decimal place value lab?

Slide each digit slider (tens, ones, tenths, hundredths) between 0 and 9. The lab builds the decimal value digit by digit, showing the contribution of each place. Try 1, 2, 5, 0 to see 12.50.

▶How are decimals used in petrol prices?

Indian petrol pumps show prices like 104.27 rupees per litre. The 1 is hundreds, 0 is tens, 4 is ones, 2 is tenths and 7 is hundredths. The lab builds such numbers digit by digit, which helps when you wonder how a small 0.50 hike changes a full tank fill.

▶Tenths vs hundredths: which place is larger?

Tenths are larger than hundredths. One tenth (0.1) equals ten hundredths (0.10). So 0.4 is much bigger than 0.04. The lab makes this clear because moving the tenths slider one step adds 0.1, while moving the hundredths slider one step adds only 0.01.