Chapter 1 Review

Since they are both single digit WHOLE numbers, just using rounding! Estimate: 9.2 x 6.8 Since they are both single digit WHOLE numbers, just using rounding! 9.2 x 6.8 9 x 7 63

When dividing, ALWAYS use compatible numbers for easy math! Estimate: 50.89 ÷ 4.6 When dividing, ALWAYS use compatible numbers for easy math! 50.89 ÷ 4.6 50 ÷ 5 10

Estimate: One meter is approximately 39. 39 inches Estimate: One meter is approximately 39.39 inches. About how many inches would 5 meters be? Since there is a DOUBLE digit number, use compatible numbers for easy math! 39.39 x 5 40 x 5 200

Solve: 5 x 1.08 You DON’T have to line up decimals when multiplying! You move them at the end! 1.08 x 5 5 4 0

Solve: 3.6 x 4.2 You DON’T have to line up decimals when multiplying! You move them at the end! 3.6 x 4.2 7 2 +1 4 4 0 1 5 1 2

Solve: 12.8 ÷ 4 When dividing the first number goes IN the box and put the decimal up right away so you don’t forget! 3 2 4 1 2. 8 -1 2 8 - 8

Solve: 7.13 ÷ 2.3 When decimals are outside the box you must MOVE them, but don’t forget to move the inside ones too! 3 1 2. 3 7. 1 3 -6 9 2 3 - 2 3

Just plug the number into the correct variable and you can solve it! Solve: 75.42 ÷ a if a = 0.1 Just plug the number into the correct variable and you can solve it! 7 5 4 2 0. 1 7 5. 4 2 -7 5 - 5 4 - 4

Solve: 3.6 x 4.2 You DON’T have to line up decimals when multiplying! You move them at the end! 3.6 x 4.2 7 2 +1 4 4 0 1 5 1 2

Solve: Eileen has $6 to buy apples at the market Solve: Eileen has $6 to buy apples at the market. If each apples costs $0.32, how many can she buy? Remember, if you know the TOTAL amount you have, it is usually a division problem! 1 8 7 0.3 2 6 18 mangos, you CAN’T buy .75 of a fruit … unless someone took a bite out of it!  -3 2 2 8 - 2 5 6 2 4