SME
Grade 5 Math
Add, subtract, multiply and divide decimals
The main lesson, then each kind of problem it solves.
Add, subtract, multiply and divide decimals
Main lesson
Multiply decimals and whole numbers
Use this for “A notebook costs $1.65. How much do 14 notebooks cost?”
Divide decimals by whole numbers
Use this for 7.2 ÷ 4: a decimal shared into equal parts.
Subtract decimals
Use this for “Subtract: 5.27 − 2.85 = ___.”
Multiply a decimal by a decimal
Use this for “What is 0.6 × 0.3?” with tenths times tenths.
Divide by a decimal
Use this for “How many 0.5s are in 3?” (3 ÷ 0.5), or 0.24 ÷ 0.08.
Estimate sums of decimals
Use this for “About how much is 12.65 + 8.3?” by rounding each to the nearest whole number.
Estimate differences of decimals
Use this for “About how much is 12.65 − 8.3?” by rounding each to the nearest whole number.
Estimate products of decimals
Use this for “About how much is 4.8 × 6.2?” by rounding each to the nearest whole number.