B3 -  Calculations on decimals - Additions, Multiplications 

Examples :  $4.2+3.7+5.6$  ; $0.5\times 42.4\times 4$

B4 - Calculations on decimals - Multiplications by $10$ $100$ $1000$

Example : $64.56\times 100$

B5 - Calculations on decimals - Multiplications by $0.1$   $0.01$   $0.001$

Example :   $28.5\times 0.01$

B6 - Calculations on decimals - Multiplication by a power of 10

Examples :  $12.3\times 100$   $28.5\times 0.01$

B7 - Calculations on decimals - Additions and multiplications with parentheses 

Example :  $5\left(3.2-5.8\right)$  

B8 $-$ Calculations on decimals - Additions and subtractions without parentheses

Example :  $-8.12+7.9+6.42$

B9 -  Calculations on decimals - Additions and subtractions with parentheses

Example: $39.1+\left(4.8-8.55+5.91\right)$

B10 -  Calculations on decimals - Additions, subtractions and multiplications without parentheses