Discover different tricks and methods for multiplying and dividing larger numbers quickly and confidently.
A big multiplication becomes easier when you break one number into smaller, friendlier parts, multiply each part separately, and add the results together.
Find 23 × 6 by breaking 23 into 20 and 3.
(20 × 6) + (3 × 6) = 120 + 18 = 138
Find 45 × 4 by breaking 45 into 40 and 5.
(40 × 4) + (5 × 4) = 160 + 20 = 180
Division can be thought of as repeated subtraction, or as sharing equally into groups. Long division organizes this sharing step by step, one digit at a time.
Find 84 ÷ 4 using repeated subtraction in groups of 4.
84 − 4 subtracted 21 times reaches 0, so 84 ÷ 4 = 21
Find 96 ÷ 8.
96 ÷ 8 = 12
1. Find 34 × 5 by breaking 34 into 30 and 4.
2. Find 52 × 3 by breaking 52 into 50 and 2.
3. Find 72 ÷ 6.
4. Find 108 ÷ 9.
5. A shopkeeper has 96 pencils to pack equally into 8 boxes. How many pencils go in each box?