Decimal Calculator
Choose a fast answer or optional teaching.
Practice Mode
Try the problem first. Ace gives one hint at a time.
4.8 + 2.35 = ?
⚡ Decimal Shortcut Vault
×10, ×100, ×1000
Each multiplication makes every digit worth 10, 100, or 1000 times as much. The decimal point appears to shift right relative to the digits.
÷10, ÷100, ÷1000
Each division makes every digit worth one-tenth, one-hundredth, or one-thousandth as much.
Friendly numbers
9.9 + 4.6 → think 10 + 4.6 − 0.1 = 14.5.
Important: ACELZO teaches place value, not the misleading rule “just move the decimal.” The digits change place value.