Quick tens is a mental math strategy used to make additions and subtractions easier by working with multiples of ten. To use this strategy, the number is first rounded up or down to the nearest ten, and then adjustments are made to the calculation. For example, to add 35 + 18 using quick tens, 35 is rounded up to 40, and 18 is rounded up to 20. Then, 5 is added to 20 to get 25, and 40 is added to 25 to get 65, the sum of 35 and 18. Similarly, to subtract 38 - 14 using quick tens, 38 is rounded down to 30, and 14 is rounded up to 20. Then, 6 is subtracted from 20 to get 14, and 14 is subtracted from 30 to get 16, the difference between 38 and 14. This strategy is useful in developing mental math skills and increasing fluency in addition and subtraction.

1. Draw quick tens and a number bond to help you solve the number sentences.
2. Fill in the missing number to match the picture. Write the matching number bond.
3. Draw using quick tens and ones. Complete the number bond and write the sum in the place value chart and the number sentence.